The Puffer seems to just puff up sometimes not really sure why, I can have my hand in there and act like i am going to grab him and nothing, when while watching TV we will be like hey look he puffed up. I think he does it when he gets the crabs but i have never seem him eat any, it just the only think i can think why he would.
I have had him since he was about maybe 2" he was small only cost 20 buck got 10 off since his tail had been bitten off, you can see in first pic really small tail. all I really have coral wise is condy, polyps, and xenia's and zoa's before the aiptasias killed it. but he has never missed with any of that