I will say this though. He is healthy and at times eats big meals and shows a big back but not often. He has always been the slowest eating and even when lots of food is available he some times would rather be swimming around or off doing something else vs eating. Growing up with one super eating stingray and a bunch of others who were normal and a couple others a little slow at eating probably made it so as he just didn't eat as much and didn't grow as much so far. I had three rays that seemed to stall out growth wise and not worry about eating a bunch like everyone else. I started really selectively feeding them more and the other two grew and made up a couple inches and continue to grow but no matter how much I tried with him he just does not want to eat a bunch day in and day out. So it's a blessing as he is small easy to move easy to house and does not eat allot except when he really wants to but also he is very small and it just seems odd sometimes.