Nitrite is produced from the nitrification process of ammonia. Nitrite is highly toxic to fish and should be kept below 1.0mg/l and best at 0mg/l. This is possible through proper design of your bio filtration system to encourage quick conversion of nitrite to nitrate, which is very much less toxic and useful to plants especially in an aquaponics system.
Similar to ammonia, if nitrite level is found to be more than 1.0mg/l, you should stop feeding your fish and carry out partial water change where necessary.
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