Dendro's in the sump

[blacknife]

I've been struggling keeping a little frag of sun coral's going for a while. when i first got my new job and was home every day i got them coming out every night when i had not seen them since i got them. then they just kind of blah'ed out again.

would they do better in the LRR portion of my sump? there is lots and lots of pods down there perhaps they could get some natural feeding?
or do they need a lighted portion of the day to know when to open and close?