I've not delt with this issue before, but Azrael's left gill (his left) looks almost as if his beard won't fit into it. Does that make since? He looks as though it won't lay down all the way on that side.
He is flaring normally, eating normally, acting normally, swimming normally. Etc. His face is so dark it's hard for me to see much. Shined a flashlight on it as best as I could and it def looks inflamed up underneath.
Did a 100% water change 2 days ago. Did a 30% water change today.
Going out of town RIGHT now until Sunday so I'll be sure to try and check this ASAP.