Mushrooms for the most part are photosynthetic so about 8 hours of light a day would work just fine.It does need to be supplemented with trace elements,marine snow,phytoplankton etc.Really easy corals to care for!
Feeding is always optional unless the coral is non-photosynthesis which it has to be fed.
Mushrooms coral like ricordea/yuma can modified and changed to lightning conditions, I put mine in the sand bed directly under the LED , "rock mushrooms" rhodactis is med/low light.
Oh and one thing, they don't like high-flow what out for that. Other than that pretty much they're easy coral to take care.