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Hi All, I'm in the process of making up some fert dosing solutions and I've noticed that the dry trace powder I've bought (TNC) has copper in it; is this gonna kill my shrimp? Thanks G

Thanks again; more interesting stuff. I might do some digging and see if I can find any solubility data for Ca3(PO4)2... g

Ah, that's interesting. I knew that phosphate was added to UK tap water but I didn't know it was to precipitate out lead-salts. I'm not sure what you mean about "free-phosphate depending on calcium content"? In the typical pH range of tap water (6.5-7.5 say), any PO4 source (sodium phosphate...

Quick Question: I'm in the process of making up some fert solutions (KNO3 and annhydrous MgSO4) and was wondering, since my tapwater seems to routinely have 3-4 ppm PO4 already, do I need to add any more? I have an HMA unit and do 30-40% water changes weekly... Thanks

Hi All, I'm new to this forum (which I like a lot btw) and also new to "planted aquaria" although I have been keeping community-style aquaria for 15 years or so. I'm also a research chemist by profession and have an interest in the "water chemsitry" aspects of the hobby. Having taken a look...

I'm new to this forum (and like it a lot by the way) and I'm also a professional chemist so I thought I'd throw my two-pence-worth in... Personally, I'd be very wary of purchasing KNO3 from I supplier I wasn't entirely sure of. I'm genuinely not trying to scare or worry anyone but I wouldn't...

thanks for the info on the probes. Probably too expensive to justify though!

thanks for the reply, Darrel. Can you get selective electrodes for NO3/NO2/NH3? I didn't think these were available... And you're right, there is always the possibility that there is something else going on in the tank that is affecting measurements. For instance, I've noticed that something...

thanks for the reply. I've tested my test kits this afternoon with some NO2 and NO3 solutions (I work in a chemistry lab) and they're spot-on. I had been using a JBL daily fert (without N and P) but yesterday I switched to a Tropica fert (with N and P). I've just tested my water again and now...

thanks for the reply... I perhaps should have mentioned that when I was adding ammonia (pre-fish) I could observe the oxidation from NH3?NO2?NO3 (test kits) and was using water changes to remove the NO3 that built up. I'm pretty confident that the test kits are fine (Sera). If the plants are...

Basically: 300L Aquarium, heavily planted with LED lighting and CO2, external thermofilter Tank was cycled for three weeks with 4 ppm NH3 and denitrol 3 Rainbowfish added, water monitored daily for 2 weeks (0 ppm NO2/NO3) 3 more Rainbows added, water monitored daily for 2 weeks (0 ppm NO2/NO3)...