Duhhh you said that in your first post.. sorry.
The corals that you are asking about will get the majority of the food needs throught thier photosynthetic process, but this can be supplimented with any food that is the right sized particle and contains C and N. They use C and N for tissue developement, so a small ammount ill not hurt at all.
Thier are a bunch of foods out thier that contain the above, but for me I just prepare a home made formula, using fresh seafood blended to have small enough particle size for corals and large enough ones to feed everything else up the food chain. My mix has salmon, shrimp, scallops and some nori for the algae eaters. I also put a little selcon in for the fish but the protien and hufa acids are really good for the corals to.
Mike