I am using chemi pure elite to help with my high phosphate problem (all other water parameters are good). I am somewhat reluctant to use unatural remedies to problems as there is usually a downside. Can anyone think of a downside to using it or has anyone had a successful tank using it indefinately? By the way I have a 65 gallon FOWLR, shrimp, crabs etc.. which I will hopefully turn into a reef in the coming months.