Well in the past two weeks or so I have lost an Angel fish and Cory catfish and a Guppy. Two days ago I noticed my other cory on his side and figured he would die too. At night I turn the filter down to feed and keep it low through the night. So when I came down to turn it up the next morning the cory was right side up again. Later that day the fish was over on his side in the corner and i was sure he was dead but I did not have time to take him out that minute. So when I came down to feed he had not been eaten and I found that odd but I went to scoop him out with the net and he started trying to swim again. I gently moved him from the corner to the center of the tank but he just layed there. I fed the fish and turned down the filter. The next morning he was once again right side up and had moved himself to a new location so I decided to keep the filter down through the day and he seems to have moved himself (although I have not actually seen him move) and he is not yet dead. I am wondering if there is anything i can do to heal him. Also do you think this is contagious? Should he be moved to another tank? i have a ten gallon but it has 3 guppies and another cory (of a different species) in it. I really do not want my other cory to die though (he is my longest living fish) so i am apprehensive to put the sick one in with him. Can the sick fish go in qa tank that has no filter? If so then i do have a place he can go. Or do you think there is nothing I can do and he will die? Thanks for any input!