I've had them for about 4 months, I just sold my first batch of juvies from the spawning. I"ve found that keep them at 78-82 keeps them happy and more colored. Also these get fed brine shrimp, Daphna, freeze dried blood worms and flakes.
Lighting is also key. I have a grow bulb and an antic blue bulb in there set up. The blue really brings out fish colors.