Thanks for all the advice ! So I should buy new sand and pre-cycle? Its a 90 gallon tank filled with corals... I will post a pict soon. As far as fish goes I got 2 large tangs, pair of clowns, 1 melanarius wrasse, 1 royal gramma, (6 total) two inverts. I guess about 130 lbs of live rock lots of corals incrusted, etc.. I don't think I will have enough time to cycle the tank.