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I think they really do not have high light requirements. I have never heard of anyone successfully keeping them in their aquarium. Maybe someone else will chime in on them. Did you see them on ebay? If so that ebay seller is trouble. I had a round with him.
serpent stars, feather dusters, sun polyps and several mushrooms do not require much if any light. Button polyps, clove, polyps, xenia, candycane all do not have "high" light requirements. How much light do you have?
As you can see, not a lot at all. I have successfully kept some corilamorphs for some time now and would like to add more, but a little variety would be nice.
I have never known them to be hard. I have several in my tank. I do nothing for them. They eat the plankton/scraps from the water. If you do not have corals that you feed you may consider giving them some plankton about once a week. Other than that just watch them.
I cut the bottom out of a 2 liter bottle then I place it over the coral to feed (thanks lando). This keeps the fish crabs etc from stealing the food and after a while just "fluff" the water to stir up the settled shrimp that did not get stuck to a polyp.
Good luck