the spot on the puffer sounds like some sort of fugus. can you get a good pic of the puffer ??
I really can't get a good picture because the water is so cloudy. I think once I fix that, He may get better. I would just leave him in the tank and treat it because it's only the puffer, and a domino damsel in the tank. No corals or any other inverts besides a few snails.
But before I treat for Ich, I want to make sure. But I need to get the cloudy water under control. What do I do about that? I have tried everything I can think of!