I have a juvenile clown knifefish about 3" and I got some little feeder guppies for him today. My question is will the knife only eat as many as necessary at a time or will he try to stuff them all in his mouth and kill any others he can't eat? I am asking because I had a peacock bass that I thought would quit eating when he was full but kept on eating till he choked and I dont want this to happen to my knifefish.