I think they don't care about light. Totally non-photosynthetic. I've got mine under a bit of an overhang but in a very well lit tank (LED's). Every one I've seen in it's natural habitat has been in low light area's though.
But I've found with mine it's no where near as sensitive to light as my blastomussa's. It also seems to like a bit of flow but not blasted by a power head.
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