i have a porcupine puffer that was fine up until about 2 weeks ago.since then he has been at the bottom of the tank and hiding out.he also has a small lump on his back under his skin and is only using on side fin.before he got like this he was the picture of happiness everyone loves him because he had so much character...you know 'a happy little fish'.if anyone has any idea of what could be wrong please let me know.he is not eating and he always got along with the other fish in the tank(tangs,damsels,nigers the usual).he is about 4" long now i've had him since he was about 1 1/2".i dont get it one day he went unhappy please help.
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