i'm referring to more on the brownish/whitish corals like the bubble coral, some mushrooms, and others....but thanks for the input

I guess it depends on specific corals whether or not they fluoresce under actinic light
By the way, I noticed that for bubble corals, when light is off, the bubbles dissappear and tentacles emerge (lots of them!). I guess it's feeding time for them but do I have to feed them with frozen brine shrimps at that time or just leave it be? BTW, do you feed your bubble corals using frozen food or use some coral food solution?