Thanks for the reassurances. First time any one compared my tank to a toilet, not so sure thats a good thing, but it made the point.

To my knowledge neither the algone or the nitrate reducer is a chemical additive. The nitrate reducer is a bacteria based product, available through DFS.

On the algone website www.algone.com they state that the product is safer than chemical additives but don"t offer much more info than that. I'm going to call them for more info.

The state of the tank overall is healthy, good fish longevity, strong coral growth. Just can't seem to get the nitrates down below 20-30.

Lakester