I just noticed my fish is acting weird. He is swimming OK, but he has a funny bump under his chin, and will not eat his food. It more seems like he can't, because he was picking at it, when he usualy attacks it, and he was swimming up and down looking at it and trying to eat it, but changing his mind at the last minute. I'm leaving him with petsitters in a few days, and I really don't want him to die while in their care.
Any help would be appreciated.