When I first got mine they wouldn't eat. They would mouth the food and spit it out. I tries feeding them all the good stuff (mysis, mini-mysis, marine cuisine, rod's food, H20 life frozen) and they wouldn't eat. I tossed some spectrum pellets in a few days later and they ate them like they were little fish skittles. After they ate that for awhile they strating eating everything.
So I don't know if they actually liked the pellets more or it just took them a few days to eat.