I got one that was 7" when I got it. Doesnt eat too much, didnt eat in my aquarium for about 2 weeks, and now only eats pellets. Had him over 6-8 months and he is still really healthy. Does not really crunch corals or rocks, but can scrape algae off the rocks a bit. Not a harmful or aggressive fish at all. Easy to care for, doesnt get over 8"(some parrotfish species get way bigger, but this one never exceeds 8") and doesnt eat as much as some say. Great fish, and amazing colors....I love him. Get one, you will be happy.