I have a 50 gallon SW tank with about 60lbs of live rock, 2 percula clowns, an algae blenny, firefish, 1o hermit crabs, 5 snails and 3 small corals (duncan, neon tree and electric torch).
I have never been able to get my nitrates down to 0, it always hangs around 10 ppm, which I suspect is...