Please help! My fish is sick
Hi everyone! This is my 10+ year old crystal parrot fish named Potato. Recently he developed what I’m assuming is swim bladder disease. I immediately began to fast him and moved him into a 40 gal hospital tank. After a few days it was clear he was having bowel movements so I resumed feeding him 4-5 large cichlid pellets every other day. I have also been doing 15 minute Epsom salt baths every day. He is not getting better and decided to stop eating today. The issue clearly isn’t constipation (I think) so I’m thinking it’s something internal, parasitic or bacterial. What medication should I start with? I would prefer to dose the water rather than feed medicated food since he won’t eat right now. Thank you so much!!!
For context, the first pic is what he normally looks like. The second pic is from a week ago and the third is from yesterday.