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  1. dw1305

    Powerhead safety and glue/repair

    Hi all, Bin I'm afraid. cheers Darrel
  2. dw1305

    In tank ph temp tds monitor

    Hi all, No, but it looks interesting. It should work pretty well for "Temp" and "TDS", pH might be more of an issue. If it is an <"ISFET probe for pH">, that would also work pretty well. You could ask them the question? There doesn't look to be a glass reference electrode and if it was...
  3. dw1305

    Fluval marketing.....

    Hi all, When I wrote it, I was thinking of Frankie Howerd (video for younger aquarists), but have subsequently the found the "initialed it" bit was a story told by <"Truman Capote">. cheers Darrel
  4. dw1305

    Fluval marketing.....

    Hi all, <"Another comment"> I didn't think I'd find on UKAPS. I'll have a go, I have a very short one, there isn't room to brand it, but it is initialed. I don't use it very often, I've found blowing/sucking on a piece of tubing is more effective. cheers Darrel
  5. dw1305

    Fluval marketing.....

    Hi all, The advertising really puts me off buying products from any of <"these companies">. I think "if I buy this your advertising has worked". cheers Darrel
  6. dw1305

    DIY Purigen Reactor/Regeneration technique.

    Hi all, I like <"Siporax">, I wouldn't go out of my way to buy it, but if some-one gave it to me I'd definitely use it. cheers Darrel
  7. dw1305

    DIY Purigen Reactor/Regeneration technique.

    Hi all, No, I think it does what it says on the packet. Have a look at page 3. of <"FeEDDHA">. If you want "gin clear" water for aesthetic reasons, then Purigen is of interest to you. If you want it to reduce levels of DOM in your tank? then there are other options. cheers Darrel
  8. dw1305

    DIY Purigen Reactor/Regeneration technique.

    Hi all, I'm a fan of <"humic substances"> as well. If you keep a Reef Aquarium, or Lake Tanganyika cichlids, you might want to reduce DOM, but even then there will be some present. I think this should be available to everyone <"Dissolved humic substances – ecological driving forces from the...
  9. dw1305

    Dissolved oxygen meter

    Hi all, My guess would be that they would do. cheers Darrel
  10. dw1305

    Dissolved oxygen meter

    Hi all, Diffusion of all <"dissolved gases is pretty slow">, which is why you need to maximise the gas exchange surface. You can see that this is potentially a two-way street, leading to potential <"oxygen super-saturation in suitable conditions">. You can process wastes with really high BOD...
  11. dw1305

    Dissolved oxygen meter

    Hi all, That is one of the reasons why I've pushed <"dissolved oxygen as being so important">. It was only when I started posting the cycling threads that I began to realise that there was a, <"pretty much total, disconnect"> between aquarists views <"on nitrification"> and waste water...
  12. dw1305

    Dissolved oxygen meter

    Hi all, Yes, I think it is probably about right. There are a few minor caveats, was the temperature* the same? etc. *edit: <"The meter"> has automatic temperature compensation The thing we really don't know is: We don't know the state of the inside of the canister filter. Because there is...
  13. dw1305

    Dissolved oxygen meter

    Hi all, Thank-you, I'm still proud of it. I've added a link in to the <"original post">. Yes and no, laminar flow is really what you want in the tank, so that the water from the bottom of the tank is continually circulated to the gas exchange surface. If you are reliant on direct aeration...
  14. dw1305

    Dissolved oxygen meter

    Hi all, That was really where I ended up, and it was why I wrote <"Aeration and dissolved oxygen.......">, about <"~fifteen years ago">. It wasn't entirely <"well received initially">, but I think it has stood the test of time. You can get galvanic probes, they sell one meter for aquaculture...
  15. dw1305

    Dissolved oxygen meter

    Hi all, If it wasn't for the cost they would be a recommendation for a meter that is pretty <"much "plug and play">. Yes it does, I've just looked and I had no idea they were that expensive for that model. We've had a meter/electrode to trial, and it has seemed pretty good. cheers Darrel
  16. dw1305

    Dissolved oxygen meter

    Hi all, The Thermo "Orion Star"ones are pretty reasonably priced. The <"A123"> is about £650. cheers Darrel
  17. dw1305

    Where can I find a long shallow tank (U.K.)?

    Hi all, I think 8 mm glass is a good idea, and even then I would have a central brace on a really long tank. cheers Darrel
  18. dw1305

    Any other use for a biorb, other than the local tip

    Hi all, Use the light, but you don't need any filtration. It will maintain <"high humidity"> and allow you to grow more demanding ferns etc. Acid carboys used to be popular for this sort of thing, and they are as close to a BiOrb in shape as you can get. cheers Darrel
  19. dw1305

    Where can I find a long shallow tank (U.K.)?

    Hi all, Should be plenty thick, even with the 5' length of glass you have very little water depth, so little internal pressure on the glass. cheers Darrel
  20. dw1305

    Any other use for a biorb, other than the local tip

    Hi all, 100% terrarium. George set-up one. cheers Darrel
  21. dw1305

    Safety concerns!!! Non Standard UK Plugs and Adapters!

    Hi all, I do this. cheers Darrel
  22. dw1305

    Suggestions for a good Auto feeder!

    Hi all, That one. cheers Darrel
  23. dw1305

    Section off Floaters without affecting flow or aesthetics

    Hi all, I had the same experience, it continually went under <"until I stopped rescuing it">. Mine never looked anything like as healthy as @Gill 's. cheers Darrel
  24. dw1305

    Twigs

    Hi all, I'd just put it in the tank. Fruit wood is used quite a bit for <"feeding Panaque spp. etc">. I think Morus spp. have contrasting darker heartwood, Morus alba definitely does, but I think M. nigra does as well. cheers Darrel
  25. dw1305

    Twigs

    Hi all, You are absolutely fine to use them, and you don't need to boil them. cheers Darrel
  26. dw1305

    pH tester

    Hi all, I think for most us they probably are, the real issue is for CO2 users, where not knowing what the pH is can easily lead to asphyxiating all your fish. cheers Darrel
  27. dw1305

    pH tester

    Hi all, I know, "CO2", "pH", "TIC", "NO3", "ion" are all too short to use as search terms. I cheat a little bit by adding "bromothymol", "NO3-" etc. to any CO2 etc. posts I make now, but it doesn't work for finding other people's posts, or for my older posts. Yes, you can use a <"narrow range pH...
  28. dw1305

    pH tester

    Hi all, You can, but usually in situations where you already have a good idea what the pH is likely to be. The problem is really that pH is a very strange measurement, it is both a log10 scale and a ratio. If you have hard, salts rich, water then the pH will always be about pH8, and your pH...
  29. dw1305

    Nursery propagator with ultrasonic misting

    Hi all, Very nice. I love foggers. They were just coming into commercial horticulture when I left, but they were obviously going to be the next big thing because you could root really small, soft cuttings with them. I'd go for a much <"weaker salts mix">, no more then a 1/4 EI and probably...
  30. dw1305

    Digital thermometer recommendations please

    Hi all, Same <"for me">. cheers Darrel
  31. dw1305

    AQUARIUM WITH BUILT IN FILTRATION COMPARTMENT

    Hi all, Perfect. cheers Darrel
  32. dw1305

    superglue?

    Hi all, I had a persistent cut in the tip of my finger and eventually I thought "I'll super-glue it". The good news was that it sealed and healed really quickly, the bad news was that it "stung a bit" (a lot) for about two days after application. cheers Darrel
  33. dw1305

    Led bulbs

    Hi all, I prefer a higher kelvin value for the lights in terms of looks as well, but a 4000K light will still provide plenty of PAR. The main difference is that the 4000K one gives you a more yellow, slightly warmer light than a 6000K one. cheers Darrel
  34. dw1305

    Tissue Culture

    Hi all, There isn't a huge amount of science knowledge required, but it would really help if you understood a bit about aseptic culture and the scientific method. We had the problems that @X3NiTH notes in the Barr Report thread, it is really difficult to avoid microbial contamination. I'd...
  35. dw1305

    Tissue Culture

    Hi all, Certainly has. Does he still post on the Barr Report? We used to do it as <"part of one of our courses">, and years ago I did a feasibility study for a large <"UK ornamental plant producer">. As a commercial concern, you would need to find a niche market and then you might find that you...
  36. dw1305

    Question about PH controller.

    Hi all, I'd do that. You'll probably find a bit of drift at both pH4 and pH10, but not a lot. Because pH is a log10 scale as you move away from pH7 you tend to get a <"more "accurate" reading">. I like the <"instruction page"> link for the WEIPRO, nice and clear. That would be my worry. I'm...
  37. dw1305

    pH Probes

    Hi all, That should have been three molar KCl for the storage solution and 0.1M KCl for the reference solution (insider the probe). They all used to be refillable (with KCl), most of the newer probes are sealed, and have a finite life. Usually you can buffer the meters, the buffer solutions...
  38. dw1305

    pH Probes

    Hi all, I don't know quite how the cheap probes work, they won't have a silver (Ag) wire in the probe, but presumably a cheaper alternative metal. They are <"quite complicated bits of kit."> I don't usually recommend putting too much reliance on pH as a measurement, that isn't because it isn't...
  39. dw1305

    Hydor External Heater vs Schego Titanium

    Hi all, I've never had a Hydor heater, but if you wanted to go down the Schego route you could buy an off the shelf controller like an "Inkbird ITC 308 temperature controller". I'm not too worried about the heater failing and not heating, I'm much more worried about the heater sticking on and...
  40. dw1305

    Inadvertent Heating

    Hi all, They have quite strong heating effect in a nano. If you have a small tank with a lid as well and then factor in the light they will often read ~5oC warmer than the the room temperature. This isn't ideal in the summer, but useful at other times of the year. cheers Darrel
  41. dw1305

    Söchting Oxydator

    Hi all, I'm not sure, I think titanium would do. It is "transition metals" that are the catalyst, and I assume that it is cheaper then silver. Platinum or palladium would presumably be the best options, but more expensive again. I assume one of the reasons for the ceramic is to control the...
  42. dw1305

    Söchting Oxydator

    Hi all, That is what they are doing, the extra oxygen comes from the break down of the hydrogen peroxide (H2O2). The reaction is 2H2O2 ~catalyst~ 2H20 + O2. The catalyst was traditionally a small piece of silver (Ag) wire, I assume the "ceramic catalyst" has some silver in it <"somewhere">...
  43. dw1305

    Söchting Oxydator

    Hi all, It would really be what @mort says. People would look at a coral reef, or the surge zone of a Rift Valley Lake, and says this is an alkaline, high oxidising environment with very low levels of nutrients and DOC. This is true, but it is only <"part of the story">. These are difficult...
  44. dw1305

    Söchting Oxydator

    Hi all, We have a <"few threads"> mentioning them. They had a vogue with Rift Lake Cichlid keepers about 25 years ago, but like a lot of these things it didn't last people were soon onto something new. It isn't snake oil, but there are other ways of achieving high oxygen levels. cheers Darrel
  45. dw1305

    Cleaning Hanna PH Tester

    Hi all, @zozo is right, it is no different from testing any water, you can clean the electrode up under a running tap, a quick rinse with DI and into the storage solution. The important thing is that the electrodes (unless they are ISFET ones) are stored in the three (or four) molar...
  46. dw1305

    Cleaning Hanna PH Tester

    Hi all, In most cases you store the electrode in <"four molar KCl">, so you don't have to worry about it harbouring micro-organisms. cheers Darrel
  47. dw1305

    Looking after PH Probes, how ?

    Hi all, Yes, exactly that. cheers Darrel
  48. dw1305

    Looking after PH Probes, how ?

    Hi all, It does, the reference electrode used to be refillable with KCl, but now they are often sealed, so once the KCl has leaked out you have to buy a new electrode. cheers Darrel
  49. dw1305

    Looking after PH Probes, how ?

    Hi all, I should have put the workings for that. potassium (K) RAM = 39.1 chlorine (Cl) RAM = 35.5 potassium chloride (KCl) RMM = 39.1 + 35.5 = 74.6 So 74.6g of KCl made up to 1 litre with DI water is a molar solution. 74.6 multiplied by 3 gives you 224g, and 224g of KCl (in one litre of...
  50. dw1305

    Guess who's back..... Henry goes steampunk...

    Hi all, I have the same opinion as @mort. Because you've taken all the substrate out etc. I don't think it will be a problem, also it is a permanent stain, so nothing is leaking back into the tank now. cheers Darrel
  51. dw1305

    DIY wood

    Hi all, That should work. If just want a very quick DIY fix you can wedge a water worked, rounded, pebble in the void. The really useful thing about spherical pebbles and cobbles is that you don't need to try and work out what type of rock they are, basically it is only really hard rock that...
  52. dw1305

    DIY wood

    Hi all, That's it, the little pellets the shrimps produce are pretty much the inert matter left that they can't derive any more nutrition from. The shrimps like the void (it offers cover) and will pick at any fungi or softened wood. There will be some ammonia continually diffusing from their...
  53. dw1305

    DIY wood

    Hi all, It doesn't matter, even if you have xylophagous fish (like Panaque spp.) that process a huge amount of wood it isn't actually very polluting. It is to do with the, <"BOD concept">, basically wood is almost entirely composed of structural carbohydrates with a very high carbon to...
  54. dw1305

    DIY wood

    Hi all, You don't need to fill it in. Just scrape any soft wood out of it. I have lots of bits of wood with central voids. cheers Darrel
  55. dw1305

    Calibrating thermometer

    Hi all, I do the same, put the back of my hand on glass, you can tell instantly whether the tank is about right, too warm or too cold. It doesn't seem like a very effective method, but you can pick up any differences. cheers Darrel
  56. dw1305

    New Led In Screwfix

    Hi all, I have a look at high bay lighting every so often as well. They certainly look pretty chunky and well made. They must be incredibly bright, I think I'd be worried about planes mistaking them for run-way lights and landing on my house. cheers Darrel
  57. dw1305

    Heater Failed ?

    Hi all, I press the back of my hand onto the tank glass every morning, it tells you whether you have a stuck-on or failed heater, and it is more sensitive than you might imagine to smaller changes in water temperature. cheers Darrel
  58. dw1305

    Nightmare morning water all over the floor

    Hi all, That sounds like an air leak somewhere in the hoses. If you rock the filter back and forwards until the air is purged (you may have to turn it on and off once or twice) it should run silently. If it keeps getting air in it you have a non-gas tight leak. These "air leaks" often don't...
  59. dw1305

    Guess who's back..... Henry goes steampunk...

    Hi all, I took a couple of photos of the plants outside the lab. There used to be Ivy (Hedera helix "Glacier") and a pip grown Pomegranate (Punica granatum) covering the wall, but about 10 years ago they removed them and exposed the building in its full 1970's architectural glory. Our last...
  60. dw1305

    Guess who's back..... Henry goes steampunk...

    Hi all, Changed from Schizostylis to Hesperantha. cheers Darrel
  61. dw1305

    Guess who's back..... Henry goes steampunk...

    Hi all, That is interesting. I've got three different ones in the garden (they aren't really pond plants, they like a damp summer, and a drier winter), but I've never seen a good white one before. They are hardy here, but I assume they wouldn't go very well some where with a colder winter...
  62. dw1305

    Guess who's back..... Henry goes steampunk...

    Hi all, I'm not sure I've seen a white Hesperantha coccinea with such broad petals before. Do you know which cultivar it is? cheers Darrel
  63. dw1305

    Bodged DIY trickle tower for sump

    Hi all, That made me laugh. cheers Darrel
  64. dw1305

    K1 micro media.

    Hi all, It works, I have it in <"one filter"< (Eheim 2224). I just 3/4 filled the media basket. <"It was">, but it will develop a biofilm in an external filter. If some-one else is buying I'll have "Eheim Substrat Pro", but I've use floating cell media, Alfagrog and Hydroleca etc without any...
  65. dw1305

    Poor Choice of TDS Meter :(

    Hi all, Bad luck, it is a "high range meter", which means that I'm pretty sure it will never be of any use to you. I'll assume the conversion from microS to ppm TDS is 0.64, but it may be 0.5 (it should say on the meter). If you search for "6.44 ppt calibration fluid" you should find some...
  66. dw1305

    Help Please - New Aquarium (after not being in the hobby for 3 years)

    Hi all, You mean like that plants (really enzymes like "Rubisco", "pyruvate dehydrogenase") have a preference for carbon12 (C12) atoms over the C13 isotope? Or is it true for the uptake of other isotopes, by other enzymes, as well? cheers Darrel
  67. dw1305

    Help Please - New Aquarium (after not being in the hobby for 3 years)

    Hi all, There is nothing wrong with the <"Tropica fertiliser"> and it will provide all the nutrients your plants need, but it is a really expensive option. Plants can only take up mineral nutrients as ions, and it doesn't matter which compound that potassium (K+), nitrate (NO3-) or phosphate...
  68. dw1305

    DIY Spraybar for Eheim InstallationSet 2

    Hi all, It is probably a bit of an expensive option but can you just add in more spray-bar sections? I think it is about ~£5 (for 2 x 10cm). INSTALLATION SET 2, PRESSURE SIDE/ SPRAY BAR EXTENSION SET: EHEIM part no. 4009620. cheers Darrel
  69. dw1305

    Fish room

    Hi all, Dual purpose, well if denim started as tent material, and we use cat litter and Bonsai soil as a tank substrate, I don't see why not. The "moving bed biofilm reactor", using Kaldnes type media, was developed in Norway in the 1980's, so it is actually quite old technology. The best...
  70. dw1305

    Fish room

    Hi all, It is "floating cell media", so it will always float. Like Xim says give it a good stir and it will eventually sink down to the waters surface. Floating is a great advantage if the power goes off, because the media has more access to atmospheric oxygen than a sand filter etc would...
  71. dw1305

    Juwel Vision 260 - lower water level

    Hi all, No, it is fine. I don't fill up most of my tanks, mainly because it gives space for plants to grow emersed. cheers Darrel
  72. dw1305

    Fish room

    Hi all, Have a look at "Swiss Tropicals" for HMF details. It is an American Company run by a Swiss Scientist: Swiss Tropicals links <"Biofiltration">, <"Mattenfilter"> , and in use <"Brian's Basement">. It is difficult to get the <"Poret"> foam in the UK, but if you want a reasonable amount it...
  73. dw1305

    Help me choose a pH meter

    Hi all, It is going to depend on the type of electrode. If it is a solid state <"ISFET"> meter designed for long term immersion it is probably OK. If it is a glass electrode, until the electrode fails it will give you a ball park figure, with certain proviso's. The problem for all pH...
  74. dw1305

    Help me choose a pH meter

    Hi all, I haven't used either of them, but Hanna is a good brand and I'd probably go for the second model. Two point calibration is what you need, but you need to calibrate the meter before every use, using both the pH4 and pH7 calibration buffers. If you use EI your tank water will have a...
  75. dw1305

    Seneye Water Monitoring System

    Hi all, John is right, pH meters are quite high maintenance bits of kit. I'd recommend that any-one who is thinking about buying a pH meter reads this thread (on <Apistogramma forums>), written by "Regani", a chemist: <"A note on pH meters">. Seneye doesn't use a probe, if you have a look in...
  76. dw1305

    Seneye

    Hi all, I'm just going to correct the post above, mainly because I start writing it before I'd found a suitable image and I couldn't find exactly what I wanted, so I put in a reflectance curve, rather than an absorbance one without changing all the text. What it should say is If we stick...
  77. dw1305

    Seneye

    Hi all, It would probably depend a little bit on how tannin stained the water is, and also the colour of the slide. Without knowing how the slides in the Seneye are read, what would normally happen is that a specific wave length of light (in nanometres and corresponding to the colour you are...
  78. dw1305

    Seneye

    Hi all, Reviewing this thread, I see that I never answered this one. The pH readings in the very soft tap water are likely to be very variable, as any small changes in water chemistry will cause large changes in pH, but once the water is buffered to dKH5 you should get a more stable reading...
  79. dw1305

    Seneye

    Hi all, OK that covers the "low ionic strength" issue fairly fully, and we can discount that. I've had a look at the pages on the pH pages Seneye site <what is pH - Seneye> and it is quite good as a description (he also uses the "balance" analogy as well), but the bizarre thing is that having...
  80. dw1305

    Seneye

    Hi all, Fair enough, at least they are honest about why there are problems with pH measurement in water with low conductivity ("ionic strength"). Not so sure about this however, seems to contain a certain amount of scare mongering and urban myth, and doesn't exactly fill me with confidence...
  81. dw1305

    Seneye

    Hi all, It should carry on giving you a fairly accurate measurement in sea water. There are two problems with pH probes as you approach pure H2O. The first is that pH probes are "combination electrodes" that function as a galvanic cell. This means that as the conductivity of the water falls...
  82. dw1305

    glass thickness

    Hi all, I think "ian_m" is right, the main need for thicker glass is the depth of the tank. If you have less depth the glass thickness required should come down a lot. I've always fancied a big deep tank, but as a paludarium set-up. cheers Darrel
  83. dw1305

    Twinstar DIY

    Hi all, I think you are right, and I think you could have a stainless steel cathode. Platinum would be the best, but expensive, option cheers Darrel
  84. dw1305

    DIY Chiller

    Hi all, I think she is looking at a second hand "beer chiller" now, or possibly a new lab. cheers Darrel
  85. dw1305

    DIY Chiller

    Hi all, We had a go at pimping/DIY one of these for a colleague who works with tufa, and we didn't get much cooling effect. cheers Darrel
  86. dw1305

    Live food for fish, Lumbriculus and others

    Hi all, Another site that I could spend too long looking at. I've got some Black worms you could have if P&P from the Netherlands proves prohibitive. cheers Darrel
  87. dw1305

    Digital Timer Recommendation Needed

    Hi all, Throw away the digital ones and get mechanical ones, they last much, much longer. cheers Darrel
  88. dw1305

    hose clamp verses filter clamp differences

    Hi all, The double and single taps are pretty secure, if you mean these ones <http://www.charterhouse-aquatics.co.uk/eheim-accessories-taps-couplings-c-268_265.html?osCsid=e586e87051ae0d0c22ea1c21cb395b3c>? You need to slide the tubing on with the screw lock fully open, and then do it up until...
  89. dw1305

    Looking after PH Probes, how ?

    Hi all, Assuming it isn't a solid state IFSET probe?, You need to store the electrode in a 3M KCl storage solution. Once the membrane has dried out it will never give reliable readings. You can buy the solution, but it is much cheaper to make your own "dissolve 22.4g of KCl into 100cm3 of DI...
  90. dw1305

    Twinstar DIY

    Hi all, It could go either way, what you wouldn't know would be what effect the nano-bubbles have on the shrimplets, particularly if they get beneath the carapace. If it did work (and that is still a big "if" in my opinion), it may also reduce the biofilm on surfaces, Catappa leaves etc. that...
  91. dw1305

    Twinstar DIY

    Hi all, I think you are right in both cases, this is in the "main" Twinstar thread <Twinstar..what is it? | Page 9 | UK Aquatic Plant Society>. cheers Darrel
  92. dw1305

    Seneye

    Hi all, I'm not making excuses for Seneye, and I wouldn't use their devices even if some-one gave me one, but this is true, pH is a fairly meaningless measurement in very soft water. cheers Darrel
  93. dw1305

    Heat mat for DSM

    Hi all, Yes it does. cheers Darrel
  94. dw1305

    Heat mat for DSM

    Hi all, I've got a "Rootit" mat and thermostat for the glasshouse at work, and that seems pretty good. Amazon etc sell them. cheers Darrel
  95. dw1305

    Bubbles from in-line atomizer

    Hi all, I agree with Iain, take the sponge out. In fact I'd go further and take the floss out as well. If you want to replace them with some other media, just add Alfagrog, glass/ceramic rings, Eheim "coco-pops" etc. I like a sponge pre-filter on the intake for ease of cleaning, but I keep...
  96. dw1305

    non-bought wood

    Hi all, The leaves do, so I would expect you would get some. With wood most of the tannin is usually in the bark, which is why Oak is used for tanning (thick bark - lots of tannins). We've had a thread on these on apistogramma forums, and the answer for deciduous magnolias (like M. stellata)...
  97. dw1305

    non-bought wood

    Hi all, Camellia leaves are OK, so I should think dead wood would be all right. "Tea" is a Camellia species, so it shouldn't be toxic. You need to keep away from Rhododendron. cheers Darrel
  98. dw1305

    Boil wood

    Hi all, No, just let it sink. cheers Darrel
  99. dw1305

    EU extension lead

    Hi all, I use these as well, and they are fine. cheers Darrel
  100. dw1305

    New rocks. What do you think about it ?

    Yes, yes and yes. cheers Darrel
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