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Plants looking sorry for themselves in the last 2 weeks

jonnyuk

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6 Oct 2010
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12
hi all, over the last 2 weeks my plants have started to look very leggy, leaves going yellow with holes in them, green spots on the leaves.
Setup for about 6 months
Dennerle 55l scaper
fluval 307 filter
CO2 - about 2bps - comes on for 5 hours (1 hour before lights on, off 2 before lights off)
Lighting Twinstar 450e - 2.30>8.30 with a 1 ramp up and down in that time as well, set at 35% at the peaks.
Dosing 5ml a day of TNC complete
2.5ml of Seachem Excel
weekly 30% water change
i would say heavily stocked fish wise

I changed my dosing 2 weeks ago from tnc lite to tnc complete because i thought i lacked nitrate and phosphates. I do test weekly for nitrates and have always recorded 0 pm, hence my move to nitrate along with my floating plants showing signs of lack of nitrate etc. the irony is my floating plants look good at the min, maybe too much shading?

i still suspect a lack of nitrate and phosphate, i'm also suspecting a lack of CO2 or maybe flow of CO2

hope someone can point out my errors and offer advice before any algae gets out of control
thanks
 

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dw1305

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7 Apr 2008
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nr Bath
Hi all,
the irony is my floating plants look good at the min
They look good. Plant health looks OK all around.
i'm also suspecting a lack of CO2
Could be, your floating plants aren't CO2 limited.
maybe too much shading?
Turn the light intensity up.
i still suspect a lack of nitrate and phosphate
Can you get a shot of the floating plants from above?

cheers Darrel
 

jonnyuk

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just took some quick pics of the floating plants. in comparison to how the plants looked 2 weeks ago they look a right mess (not all of them it has to be said)
 

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dw1305

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Hi all,
in comparison to how the plants looked 2 weeks ago they look a right mess (not all of them it has to be said)
Perfect, they still look pretty good, but I think the Frogbit (Limnobium laevigatum) is just beginning to show the signs of <"iron (Fe) and/or magnesium (Mg) deficiency">, you can see the paling and net pattern chlorosis on the leaves. Iron deficiencies show in new leaves and it takes a while for the plant to perk up after iron becomes non-limiting.

Have a look through the linked threads in <"Brown, fuzzy........"> and <"pink tint...">

cheers Darrel
 

jonnyuk

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Thanks Darrel, i'll have a read, so the plants in the second in my first post are ok? they don't look great, full of holes, disintegrating?
i watched my doser yesterday at the time it was suppose to run and nothing happened, so i suspect my doser is playing up, i've marked the tub so will see today if it runs and volume of ferts reduces
 

dw1305

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nr Bath
Hi all,
so the plants in the second in my first post are ok? they don't look great, full of holes, disintegrating?
No, they don't look great. The problems, in diagnosing what may be wrong with them, are:
  • These are old leaves, so it is possible they are still present from the time when the plants were produced emersed. You would really need to know what the new shoots, (that grow now), or the replanted tops, look like.
  • Deficiencies in old leaves are caused by lack of a mobile nutrient (the plants can move that nutrient to the new leaves). Most plant nutrients are mobile, so that gives quite a few possibilities. The most likely are nitrogen (N), potassium (K), phosphorus (P) and magnesium (Mg) just because they are the mobile nutrients that plants need the most of.
  • CO2 limitation is always a possibility in plants which are underwater.
That is why I choose a floating plant for the <"Duckweed Index">, they aren't CO2, or light, limited, so you've instantly removed two variables from the equation.

Originally I used <"Lemna minor (Lesser Duckweed)">, which has the advantage of very quick growth, meaning that it a very short response time when a nutrient becomes non-limiting, <"even a non-mobile one like iron (Fe)">. The disadvantages it has are:
  • It is always <"yellow green in very soft water">, even with nutrients present.
  • Aquarists are, understandably, very wary about introducing it to their tanks, because it is a P.I.T.A to harvest and potentially gets everywhere.
  • It doesn't persist at all in soft, low nutrient water, meaning that you can't use it in tanks for Apistogramma etc.
cheers Darrel
 

jonnyuk

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6 Oct 2010
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think i found the source of the issue, my doser was not running, i have a jebao 2.4 (single channel wifi version) and the interval was set to 1 which i belive is wrong.
i did some maintenance over the weekend, removed all the dead leaves and replanted the stems, so far so good.
 

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