I move him to 2 gal to take a closer picture, He lives in a 54 gal with bgkDoes it look like it’s white and fuzzy? Or does it look like it’s skin deep or deeper?
What are it’s tank mates? Anything aggressive?
For right now, clean water is your best option. If it is fungus, medication will be needed.
(It also looks like it is in a smallish tank - how big is that tank?)
@Colin_T I need help with this too, cherry barbs lying on the bottom of the tank and do weird swimming stuff.excess mucous over a damaged area of skin.
like phoenix said, clean water and maybe a bit of salt.