I have a Ps. Crabro in my tank that seems... "mentally challenged" :drool: He is the biggest in the tank right now and LOVES feeding time, but all he does is swim up and down against the glass at the end of the tank... allllll day! He has no social interaction with any of the other fish in the tank. He is my least aggressive, if you can believe that. Why does he do this? He doesn't go in or around the rocks, he doesn't have a territory, he doesn't fight or squabble. He eats a ton but then returns to the glass.
Normal? Weird!
Normal? Weird!