55 Gallon is plenty of room. you guys are always like this. You need to chill a little bit. Some people, like me, happen to have limited $$$ and cant get a huge 240 gallon tank. I'm 15, I mow lawns to maintain my tank, It is 55, and my fish have plenty of room. If I wasn't too lazy to clean my tank and not let the cleaners clean the filth, I would get a puffer. But the puffy would eat the snails, so I cant. Puffers are great, and definitely shy at first, and I agree with Kitty, they are awesome. They will swim around, chill out, go up and down the tank. They know when u come in the room and what time it is to eat. I had one that would never puff, totally fearless. But also try feeding him silversides. That beak of his can definitely bite out those little fish. Dont underfeed him though. I underfed mine once to try and lower ammonia and nitrates. He chomped my angel, killed my little koran:nope: But that was way back when. He will perkup though, they all do. Have fun with yer fish, and dont worry about yer tank size. It's fine. Just get good filtration cuz he will eat and poop ALOT. LOL:yes: