Okay, so i've got some wierdness going on in my 55G tank. I had 4 mollies, 2 tetras, 4 platys, 1 swordtail, 1 4" long gold gourami, 1 3" long blue paradise gourami, 3 2" long sunset gouramis, 2 8" plecos, and 2 4" x 8" angels, along with a few MTS and a 4 1/2" rusty crayfish, and my tank has been up and running for about 6 months now, with regular bi-weekly 25% water changes. Saturday evening, one of my plecos "drowned" itself when it came up for air and got stuck on the power cord for the heater. Unfortunate, but acceptable considering my luck. Yesterday, i noticed the water in the tank started getting REALLY cloudy, almost a milky white, so i decided to do an unscheduled water change. About 1/2 an hour after i finished, my other pleco rammed its nose against the lip of the tank so hard it actually killed itself. An hour later, one molly and one platy were dead. Now today, I came home from the doctor to find my angels dead. Any ideas what might be going on????