i have 55 gal
with a sump. its got about 70lbs+ of live rock and a dsb
. its set up as a semi reef. i just wanted to know what is a safe leve for nitrate, i know that ammonia and nitrite r supposed to be at 0 but i heard that nitrate is almost always goin to be present and is safe to a certain level. the nitrate was at about 20ppm so i was curious to know if thats ok. its been set up for about a year now and everything looks really healthy and corraline is finally strating to take of somewhat. what r your opinions from experiience. also this might mean something. i almost totally tore down the wholle tank last night trying to catch a fish that was niping at my corals. about 85% was removed so the water has been finally starting to clear up since late last night early morn.