I recently bought 3 Green Spotted Puffers from my LFS. When I got home I noticed 2 of them have some small fungus looking patches on them. The only medication I have here at the house is Tetra Lifeguard. I didn't know if it was safe on Puffers so I wanted to ask.
From what I know it’s usually not recommended for scaleless fish or inverts.
and just curious is this a brackish tank?
Are your puffers in brackish water? I think the salt will work better than any medicine because you'll kill two birds with one stone - the salt will fight fungal infections and provide better water conditions for the puffers, de-stressing them and improving their immune system.