I'm not too sure I can do anything else for this little fish, I have very bad luck with catfish. He has a bad case of fin rot. I put him in a "hospital tank" when I noticed him gasping for air at the surface way more than usual. That was about 3 weeks ago? maybe 4? Anywho, I thought that just immaculate water could fix him because that worked for my Betta fish but the catfish got worse. He is now being treated with Maracyn and Maracyn II and has been for weeks. There are no spots of anything anywhere on him and no bloody streaks on the body. He does not have dropsy either. His appetite is great (especially when fed sinking algae pellets). He rarely needs to surface for air. However, he holds his fins clamped and has no energy. The tank has an air bubbler and his tank water is completely changed out daily and is kept pristine.
Any suggestions?
Incidentally he is about 3 years old and no other fish in his 4 year old tank is ill.
Thanks
Any suggestions?

Thanks