See how his fin or gill is swollen?What exactly are you concerned about?
Hi and welcome to the forum
Can you post some pictures of the entire fish under normal light?
I have lost my tech savvy but will these help?View attachment 159425
Looks like the base of his fin. I gave him a salt bath yesterday. Kinda looks like the swelling is going down and at least he's staying off the bottom now!Is the actual gill swollen? Or is the base of his fin swollen?