I have one datnoids and ive had him since august and i havent noticed any growth. Hes in a 180 gallon tank and hes about 2". He eats shrimp, blood worms,brine shrimp, sinkingshrimp pellets, and even flakes.He rays everyday. The ph is 6.5, nitrite and ammonia is always 0, and nitrate is always between 5 and 10. He eats until He looks pregnant! What do you thinks wrong with him?