Sam has a small tear in his belly-fin (sorry I forget the proper terminology).
Yesterday I had a bit of trouble getting him into his beer mug (temporary home) for his water change and I think the chasing and bit of extra drama may have cause a tear in his fin. I got him in there safely enough without using a net or touching him, but I had to do the "dip the cup in and create suction' trick 3-4 times. I think during that, his struggling may have caused a small tear in his fin.
He has clean salted water now so he's definitely in the best place for healing, he's eating, and seems well.
Will this heal on its own?
I am watching for infection too but what should I look for specifically?