Backyard Aquaponics
A place to discuss aquaponics

I have a 3 year old IBC system with 2 media beds and 1 raft bed. In the beginning everything grew wildly like it was suppose to do but lately nothing wants to grow and older plants leaves are turning yellow and dropping off. I have collards, cabbage, brussels sprouts, bell pepper, and others and the lower leaves just turn yellow completely with no veining. My TDS is 1700, pH is stable between 6.5 and 7. I add garden lime, potassium hydroxide, epsom salts, and iron chelate regularly. Any help would be appreciated.
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If the leaf edges are looking spotted or burned, that's probably a potassium deficiency; otherwise it sounds like nitrogen deficiency. Do you test ammonia / nitrite / nitrate?

POst some pictures? They usually tell more.

+1

The only leaves that show edge browning are the strawberries. The others just turn solid yellow. Ammonia is <.5, Nitrates 60, Nitrites were a surprise 2.0. But I am unaware of nitrites being bad for plants.

Hope these help.