Depends on who you talk to. Porc puffers seem to get pretty big, and may outgrow your 55. If you were planning on getting inverts (snails, hermits, crabs, etc.), you may be out of luck. I have a small Spotted Puffer, but so far the only inverts he may pick at are my small snails. Doesn't seem to bother the other inverts. However, my inverts were established in my tank before I got him, and I also keep him well fed. As for other fish, I have a green chromis and a christmas wrasse he doesn't bother at all. Doing research, a Dwarf Coral Beauty and a Maroon Clown would be OK. But that's my Spotted, not a Porc. Do some searching here on Porc Puffers, and you can get an idea what will go along with him. If he's just too aggressive for your taste, take him back to the LFS your b/f got him from and see if they'll trade for a more docile fish. You'll just have to find some way to do it where it doesn't hurt your b/f feelings.
