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Discussion Starter · #1 ·
Hello to all,

I have a question that always bothers me. As there is no way for testing K and SO4 in the tank (you may suggest the defficiencies by watching the plants and seeing unused NO3, PO4) you can not tell how much of these are present at the water column. So I would like to know if the excess amounts of these cause any problems or not.

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