I think Randy mentioned something about it at the last club meeting when he talked about the different steps in his aquaculture facilities. I believe he said it doesn't magically remove the stuff (ammonia?), it just chemically changes it to something that is not as toxic/harmful to livestock. I'd be nervous about using more chemicals than really necessary in a nano tank. If the Nitrates are causing a problem, it's probably better to look at where the Nitrates are coming from rather than just covering them up like MissT said.