As some of you know, my 55 had a crash of some sort. My best guess is that it was my heater, but it killed all of my coral, inverts, and a couple of fish. I've decided to empty the whole thing out, clean it up, and put new water in it. Should I put new sand in it? If so, is the deep sand bed the way to go? Or I've heard some of you talking about not having a sand bed at all. Any opinions? I sure would appreciate your help. I need to jump on this tomorrow.