I've had one for some time now - he eats frozen foods only, bloodworm, daphnia, tubifex, mostquito larva - but won't eat flakes. He's growing slowly and I believe they reach about 8-10" in the right conditions. The quality of the water has to be good all the time with them and that's the reason that a lot of them die before their time. If you want to keep yours happy, he needs weekly water changes and good food.