open his mouth more than before, especially when we open his mouth to push the flexible tubing through to his tummy. Puffer Ill … ongoing mislabeled… 2/6/06 Amanda, here is some info I received from our resident puffer expert. OMG! She has enough for an eventual 200+g tank! I scanned the thread several time, but I can’t find how large the puffer is. I think her diet is extremely poor & as you have said, overstocked. I feel the nitrates & nitrites are what is bothering the puffer, in addition to having nowhere to call “home”. I’m afraid it is doomed, unless she gets another tank for it w/a skimmer. Copper is deadly to a puffer (no scales or gill covers & some puffers may never recover from a dose (certainly will weaken immune system). If not dosing iodine properly (not sure if lockjaw is even the real prob here), as you know, sh