Can someone tell me what to do? I have 3 fry now that have died over a period of three days. When I saw that two had died, I took the others out and put them in another tank thinking that the tank needed to be cleaned and the filter changed. But now, another one is floating on the top but is not dead. I know this is not ich because there is nothing on them and they aren't rubbing against anything. If I had never seen them before, I would never be able to tell whether they are sick or not. Please help me!!!