Very easy and hardy coral. I bought mine about 7 years ago. When I got it, it was yellow. It has since changed colors several times and is now a nice lime green. It has trippeld in size in that 9 years. The main "cup" is about 1/2 inch thick. Mine is an oblong shape being about 4 inches across and about 6 inches long.
I have kept it under a varity of lights, everything from about 100W of N.O. florecents to it's current tank which has 400 DE MH 10K lights and it sits about 3 feet under the light. It get's moderate flow and I have never fed it directly.
Because the center of the coral is about 2 inches deep, ie cup, I occasionaly swish my hand above it to blow out any collection of dutris that may accumilate.
Mine did have a small 2 headed branch that started growing out from its side. I haven't really looked for it lately so I don't know if it fell off or is still there in it's back side.
There are some pic's in my gallery and a few more in my thread that you can reach by clicking on my little red house.
HTH.