About two weeks ago I came home and found the cover was off of the power head in my tank leaving the impeller exposed. I then found my male convict had what looked like a damaged eye. It was mostly white and had some white flesh hanging out the bottom. I was thinking he got into the impeller and hurt his eye. Now his eye is much better but he is sitting on the bottom of the tank on his side and moving his fins and gills fast. He looks like he has a hard time swimming, it is like he is swimming with a lead weight. He looks good as far as his fins and body and he will still come up and eat when I feed them. I just did a 25% water change. The ph is 7.4 to 7.6, the ammonia and nitrite are 0 ppm, and the nitrate is between 0 and 5.0 ppm. the temp is at 79 F. The tank is a pre drilled tall 150 gal with the mega flow #4 wet dry filter. I have a female convict that he mates with, 2 oscars, 2 mating jacks, 1 parrot, 1 pacu, and 1 red devil female and midas male that mate about every 4 to 6 weeks. In the large part of the sump I have three of their babies and a small striped leporinus. Then I have a 1.5 gallon refugium settup that is fed from the sump and overflows back into the sump, with 13 of the convics babies in it. I think that is about every thing I can think to tell you. If there is anythig you need to know just ask. Thank you for any help you can offer.