I have an ORA green birdsnest under 6 bulb T5 HOs that has been growing nicely. It's right in front of a Maxi Jet 600 and my emerald crab does often hide in it. In fact, I had assumed my emerald died and was looking at the coral under moonlights when I saw branches that didn't look quite right. It turned out the crab had gotten WAY down into the coral and I was looking at some of his legs.
I do have an oversized skimmer on my tank, but other than that, I don't do anything special.
Here it is as a frag when I bought it in early November (I think):
Here it is as of April 20:
It's grown a little more since then, and I noticed it looked like it dropped a branch the other day. I might have hit it while scrubbing algae though.