Angel Fish Swimming Upside Down And Alive

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Tank size: 55 USGAL
pH:7.2
ammonia: N/A
nitrite: N/A
nitrate: N/A
kH:N/A
gH: N/A
tank temp: 76 F

Fish Symptoms (include full description including lesion, color, location, fish behavior): Well I noticed that yesterday my Angel fish was having a problem swimming. My Kissing Gourmi kept attacking him while he was having a hard time swimming. So i put him in another tank. While in there i noticed that his fin looks dislocated and pink at the bottom of it and i have no idea what it is. I do know that it is causing him to stay swimming upside down which can't be good for him.

Volume and Frequency of water changes: I do a water change on the tank every week which is about 20 percent water change.

Chemical Additives or Media in your tank: The only things i use is aquarium salt and dechlorinater

Tank inhabitants: I am not sure of all there names. I have two Bala Sharks, a Algea Eater, tiger barb, 5 tetras and a black fin shark (looks like a catfish to me)

Recent additions to your tank (living or decoration): i have added a couple of begginer plants which i have a pic of.

Exposure to chemicals: None

Digital photo (include if possible):

Hopefully there is a way to help him any help will be appreciated.

Swim bladder, and the pink patch looks like an ulcer which are pink or red with dead white skin around it
Bala sharks really need to be in a 90 gal tank.
Plus stats would be good in ammonia,nitrite,nitrate,and ph.
Once swim bladder has progressed hard to cure.

http/www.fishtanksandponds.info/care-mai...swimbladder.htm

The red base at the fin is a bacterial disorder and it seems to have progressed out from the swimbladder or gone internal depending on which happened first.
There isnt any cure for this that i can think of.