my 8inch jar was put into a community tank when he was around 5 or 6 inches then uh i forgot to feed him a couple days ago so he get food for 2 days then uh i wake up next morning to find an angel fish in his mouth. because of the shape of the angel he couldnt get the whole thing in his mouth, i tried to rescue the angel poked the aro's back with my finger and he let of the angel. but before that i think the jar was showing me his catch thats how i was able to poke him. n e ways been feeding him on time now and he hasnt killed any of the other fishes.