Once a day feeding will be fine! It will help cut down on your tank bio-load as well.
Feed them some frozen Mysis shrimp as well from time to time, at least twice a week, not just the pellets. Switch it up with some brine shrimp and some squid.
It's real easy! I got the little dixi cups from wal-mart (Plastic) and I put the frozen cube in the cup along with a pinch of marine pellets. I than just go to my tank dip it in the tank to fill the cup up past the cube and set it aside for an hour. I than swirl the cup around to loosen it all up and dumb in the tank! Don't put the cube in frozen in your tank! They can't eat it that way. LOL
I like this pack right here as it gives all my fish everything they need and it keeps switching it up from time to time so they don't just eat one thing.
Aquarium Fish Food: San Francisco Bay Brand Frozen Saltwater Multi-Pack
Also like one person already said, give your tank a little time before putting in a CUC, you don't want your CUC to die because there is nothing to eat!