ok i finally got it to eat, but he tries to go eat the goldfish and this happens, he bites the goldfish destroys it partially with his teeth( like a piranha), then he puts it in a bag which is between his throat and mouth and you can even see the goldfish in it because its visible, and then he spits the goldfish out, and the goldfish swims like without scales, eyes, etc. what is wrong with him, he is 8" long and the goldfish i bought are the small common type ones, not the large ones, they are like 1.5" only, he does crazy stuff when he eats them like stick his mouth out of the water, dart around, splash gallons of water outside the tank, but never swallows them, is there a problem?? the tank is 55 gallons, and he has tries to eat a few blackskirt tetras but he couldn't he just spat them out and then i had to flush them while they were half dead or almost there, HE HAS REALLY BAD MANNERS, worst than an oscar's