oh sorry..i have a 75 gallon, 20 lbs of live sand, 35 pounds of LR( iknow its not enough but its gonna be a FOWLR) i have about 460 gallons of water being pumped through there per hour and a powerhead. A few hitchikers came along with my LR a starfish, 2 turbo snails, 3 sea cucumbers, and im sure quite a bit more. I am curious as to the water changes also.....