Indeed a beautiful fish, and it is dissapointing that many don't survive. However it seems you got a good one because it is eating. That is one of the hardest thing to do with this fish.
About the food. with mine I use FORMULA 2, most LFS
sell it (this will help keep its beautiful color). It is a frozen food. Mysid shrimp is good and occasionally I got mine to eat dried krill.
I feed mine once a day. Feed as much as it will eat and make sure all the excess is out so your tank doesn't get polluted.
Hope this helps[/b]