i have had a caulastrea furcata for about four months now. from my experience, they're not particularly picky about the lighting, but they like low to moderate current. mine are about 12-18" from my 12000K halides, in an area where the main jet from the powerhead passes them without causing excessive current. they are very hard, can easily be fed, and even tolerate you moving them from time to time until you find them a permanent home. hope this helps...