i have a 75 g tank fs. 1 yt, 1 clown, 1 damsel, 1 CC starfish, dozen or so snails. dual florecent light, overflow wet/dry rated for 125, ran with mag 7, two power heads in tank, dont know brands one does 270gph other does 400gph. 45 lbs of LR. 2 emralb crabs. need to get rid of asap 600 takes...