I beg to differ, my NTT has nearly tripled in size in less than a year, he was 2" when I got him and now he's 6", and my AT has also put on a good 2-3" in 7-8 months. They're growth rate is similar to a lot of other fish, they grow relatively quickly until a sub-adult size and then their growth drastically decreases. I can understand when a adult datnoid grows only 1" per year, but when you have a juvenile their growth rate should be considerably more...