I had always heard that they could be difficult to keep...mine has been in my system for 8-9 months and in that time has grown to twice its origional size.
I'd suggest moderate lighting and current...place it on the sand bed far enough away from any other agressive coral to avoid conflicts.Mine likes to be fed at least twice a week with any of an assortment of meaty foods(I use a turkey baster to place foods directly on the mouth area.Also they seem to prefer stable/mature systems that have minimal fluctuations in water chemistry(mine is a early indicator of changes in temp/sg/etc....)
Bottom line....mine has done extremely well and is a favorite in my reef!!! Below is the only current pic I have posted of mine on my web site...hope yours does as well...