Need tips on Sun Coral feeding

[dekay]

I don't keep SPS and clams, so I'm not sure what's new or old. But if I recall correctly, they had 2 tanks w/ SPS corals right now. And I think there was only one or two clams in the acrylic tank they use to have near their old store front. Problem is they haven't set up the lights yet, so the clams aren't getting any light.

Few more question regarding the sun coral. Are they sensitive to light (closes when it sees light)? Is that why I should keep it in a shady spot? It's currently located in the middle level of the tank and has decent flow, but not really a dark area. All the dark areas I could think of are the caves, but then it won't have much of a flow . I was waiting for the coral to open up last night. Started to extend at 1am and didn't fully open till 4am. I don't want to make this a habit by any means.