My hippo tang that is roughly 1 1/2 inches has had a lumpy stomach since I got him from the LFS. He sometimes rubs himself on coral (my candy cane most of the time) but he eats very well and is a fierce competitor to my ocelaris for food. Should I be worried? He acts completely normal but once in a while rubs himself on the coral and his stomach is sometimes lump but then goes smooth, so idk what’s up with him. I tried to take a photo but it went only decent. He’s in a 60 gal while I cycle the 150 so he’ll be moving in about a month. Maybe stress?