My mother-in-law has had the same pacu for over 15 years. She and her husband feed it table scraps, grapes, and minnows. It defies all that I know about fish keeping. What ever they eat for dinner, so does the pacu. Cooked steak,fish,chicken,shrimp and even rice,the pacu eats it all! It even bangs the tank when they sit down for dinner. It expects to eat when they do. While I'll never agree with their feeding habits, I'm still impressed that they have had it for so long on such a crappy diet.