Tank has been cycled and up and running since 2007 water parameters have been fine the last time I checked and other fish are fine swimming around. The corie is still alive in the isolette but she was having trouble staying upright and swimming. I read in other forums something about bloating I was able to gently get her upright so she is not lying on her side right now. I wonder could she be constipated or could this be a swimbladder issue? I put a small piece of an algae tablet in the isolette to see if she would eat it. I don't see any disease on her I thought I saw a red mark but now don't see it. The other corie is a male and is swimming around no issues.