Check out the forum on Marine Depot. I hate to say this but there is a forum hosted there by a lady that is local to me and she specializes in fish health and actually houses quite a few puffers. Her name is Kelly Jedlicki.
She might be able to give you more specialized help. You might need to see a fish vet or similar.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,