Is it fuzzy or cottony or just discoloration on his scales?
The arrow up front was just for a string of white looking poo hanging from him.Ok, I see the one at the rear now, it looks like it may be a cyst (or a tumor but leaning cyst).
Keep an eye on it to see if it grows. I'll need a little more detail on the one up front.
There's root tabs in the sand if that's what you mean but he first got this in the hospital tank and there's nothing in there.Ok, this one is odd to me. May seem like a silly question, but do you have dry ferts or anything that can precipitate in the tank?