Hey everyone. Today my dad and I found something that looked like fuzz on one of my leopard cory's dorsal fins. Well, upon closer inspection this 'fuzz' appears to be tiny little worms about 1-2 mms long. They do move, or so it would appear, and they're all over his back, dorsal fin, tail, and some are even under his belly. The other fish in the tank appear to be clear of it. I've isolated this little cory from the others, but I'm hesitant to treat for anything because I have no idea what this is. Also cories are sensitive to salt, having no real scales. I have a picture, though it only shows what I believe to be fin rot, which wasn't there yesterday. Hope someone can be of assistance. Water is clean, no ammonia, no nitrites. I change water on a weekly basis.