Mine grow out isn't phenomenal by any stretch of the imagination, but its significant to me. I got this crusted frag plug from a local guy as a throw in for some other frags I bought from him. It really wasnt more than some left overs that wouldnt come off a real frag. But it was a coral I wanted, so I ran with it. I picked it up in Sept 2016 (it the flat one on the right).
And here it is earlier this month. Its about 5" tall from the rock its mounted on, and had a dozen or so spikes. Makes me happy to see that I can keep these guys alive for a long time and they once they start to take off, they really take off. Not too bad for 7ish months of grow out in a "new" tank.