I have kept the blue variety two times with decent success.
One time was in medium flow and low light, the other was highlight and low flow.
Both pieces did really well until they were killed by other corals, my fault, I didn't notice when some corals fell on top of them.
I fed copious amounts of phyto to those tanks.
I chose the best looking pieces I could find.
Both pieces would put on a new 3/4" branch every month. New growth was white.
That is all the info I have, I wasn't expecting much out of them and was focusing more on keeping sps at the time.