well... i dont know if this is what you are asking but nitrite is fish waste and then eventually nitrite turns into nitrate which is a less toxic form of nitrite but should be kept at a minumal level. dont know if im right but im pretty sure i am. finnaly sopme one asked a question i could answer. i just wasted this because i thoguht some was asking a question instead tehy wanted a link for something they already knew. im about to break out in tears of sadness