I feed a combination of food. Small pellets mixed with multiple flakes, mainly Omega One flakes and frozen Mysis. I just dump the cup with all these food mixed in RO water right in front of my return pump outlet. All of these food quickly spread all over the tank and the fish just go wild after the food. On the weekend when I am home, I feed small amount through out the day using flakes and pellets. The Mysis twice a day only.
My previous experiences with these small Regal, they preferred dry flakes over frozen food. They are not picky eater, eat whatever you feed them.