I have tried to feed Ocean Nutrition formula one pellets to favias, acans, chalices, dendros, duncans and blastos. Some seems to accept them and others not (pellet gets dropped or expelled). I also try to vary what I feed. Other food items I have given my lps include krill, mysis shrimp, brine shrimp and blood worms.
One reason I don't think mysis are a complete and balanced food source is that many of the packaged mysis are freshwater, and probably lacking the "healthy fats" that marine organisms have.