Thanks for the info folks. I'll try the aquarium water and see how it goes. I have to add KNO3, KH2PO4 every other day to maintain the nitrate and phosphate levels in the tank, as well as the trace elements. I add K2SO4 for potassium weekly to the water. I guess my thinking is that it's more than just the fish waste that will be feeding the plants. I'll let you all know how it goes.
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