I have several corals that I target feed.
Sun coral, duncan, dendros, fungia, etc.
If you feed one head/mouth, have you fed the entire colony or do you have to feed each individual head/mouth?
Fungia should be plenty easy to feed. They're not picky. As for "dendros," are you talking about carnation corals? (i.e. Dendronephthya) or sun corals in the Dendrophylliidae family? Carnation corals are pretty much impossible to keep alive.