my armatus acts like a cichlid. i can sit in a chair with my face just a few inches from the tank and he will follow my face around the tank. he is very interested in me and not skittish at all. i had 2 adult silver dollers in the tank about 5-6 inches round. he bit the one a couple times then bit it in the head and killed it. i threw the other silver doller in my pond. anyone else see this kind of behaviour in the payara? if you share any thoughts plz include the size of your payara. mine is 15 inches and just massive belly to back.