They are in my 700 gallon stock tank in my garage with an 8' diameter. The smallest is about 13" and the biggest is 24". I have rescued them all from terrible conditions. Most are off of craiglist. There was one 12" pacu that was in a 15 gallon tank I rescued, as well as one that was 20" in a 30 gallon tall. It was literally from side to side and couldnt turn around. I feed them better than I feed my self with all the vegetables, fruit, and shrimp they get. Im about to give several of them to a cabelas near me though.