left for the weekend, and came back to a mostly dead tank sitting at about 87 degrees. that was about 3 months ago. 2 clowns and my yellow tang survived, all coral 6 other fish, and most snails didnt make it. Was pretty bummed and have let the tank get pretty rough in the interim. Got these sponges as you can see, and my sand bed turns brown every day. Going to do some carbon, tims aquatics "waste-away" tims aquatics first defense" get snails back in.. Try to manually remove the sponges. any other advice?