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Anyone here ever try aquaponics? I’m having trouble with mine. Trying to grow watercress in it mostly (there are some scallions in there too). My water cress leaves are starting to yellow slightly; seems like they are deficient in some nutruent or mineral, but I don’t know witch. Anyone more experienced in aquaponics have any advice on how you would replenish certain nutrients in the water without harming the fish?