The Puffer Forum

WIll I need to treat my other puffers since he has been in the same tank with them?

Hey guys! Im new to this forum but I needed to know what to do about my puffer! He is about 3-4 inches and I have had him for a few months now. He is in my 220 gallon system with 2 other puffers. I got him at a pet store and noticed that his stomach was sunken in but thought it could just be because...