Floating plants slowing dying - too low nitrate? - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 10-14-2018, 08:01 PM Thread Starter
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Floating plants slowing dying - too low nitrate?

Hello folks,

I have a small shrimp tank which has only a few plants like crypt parva, microsword, marimo, and some moss. Usually the nitrate reading will be about 5ppm or less. Recently, I added some floating plants like dwarf water lettuce, frogbit, and something else that I can't identify right now. But it looks like a mini version of frog bit with about 4 mm leaves, sort of like a floating clover with a tiny root system.

Anyway, it has been about a week, and these floating plants are not doing so well. For example, the edges of the dwarf water lettuce leaves are starting to sink underwater and turn yellow. Similarly on the "floating clover" plants, an entire leaf will turn yellow and spotty.

I read that floating plants are good at removing nitrates, and indeed the nitrate level is zero. Is this the cause, and should I start dosing fertilizer? (The underwater plants have some nutrients from root tabs) Or could there be some other reason, like wrong amount of lighting (the top surface of the water is only 1" away from my led light bar), slight amount of surface film (not enough to be obviously visible, but enough to prevent small bubbles from popping), etc.
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post #2 of 5 (permalink) Old 10-14-2018, 11:54 PM
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I would say it's the nitrate problem. The floaters are quite good at sucking them up, since they have ready access to light and CO2 (straight from the air).

As for your "mini Frogbit", it might be Duckweed.

Anthony


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post #3 of 5 (permalink) Old 10-15-2018, 05:15 AM Thread Starter
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Ah yes, it is duckweed.
So should I dose only nitrate, or do I need to do the whole micro and macro thing?
Or maybe even remove some of the floating plants? (currently they cover <20% of the surface area)
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post #4 of 5 (permalink) Old 10-15-2018, 06:40 PM
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Ah yes, it is duckweed.
So should I dose only nitrate, or do I need to do the whole micro and macro thing?
If you are low on nitrate you could also be low on other nutrients especially if you are not dosing any fertilizer. If you have plants you should dose micro and macro nutrients and do a 50% water change.

You could just try dosing nitrate but I suspect that by itself it will not be enoughh.
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post #5 of 5 (permalink) Old 10-15-2018, 11:53 PM
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I agree with Surf. You likely will need the basic fertilizers (macros and micros).

If you remove some of the floating plants, it will not really alleviate the problem, as the nitrates will still be zero.

Anthony


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