Ok here's the situation. Seven days ago I lost one of my favorite fish....a very healthy,beautiful male Emerald Rainbow. I had noticed he quit eating and went into hiding about 2 days before he died...yes, I knew something was amiss. I started on Pepso food, which has worked before, he ate. Well, he died 2 days after that. While this was going on, I looked closely at the others in the tank; 3 Irian rainbows, 2 Emerald raindows, 3 praecox, a few Gold Dust mollies, and my true SAE. The only prob I saw was the beta male praecox...the smaller male, he still lives tonight. This male however has a sore near the anus area. I came home tonight and found another favorite, my SAE, belly up. He had no signs of sickness, other than the last two days he was up at the top as if he was either looking for food or gasping for air...apparently it was the later. He was dead tonight. I really liked him/her. I am afraid of losing more. I have treated with Pepso, Melafix, Parasite clear, and Binox(fungus and bacteria). What do I need to do? I have not seen the signs of bloating and not eating. I don't want to lose any more. Any suggestions? Thanks to all!