I have not used anything to promote coraline growth and it's taking off like crazy. Took about 2 months to see new growth, but now I'm even seeing it on base rock that I put in the tank when I first started. My tank has been running for about 4 months +/-
I say Patience. It will grow.
I'm not ripping on anyone here. This is just an observation that I see amongst reefers:
It's a slow hobby. As the old saying goes, "Nuthin' happens fast in a reef tank, except a crash."
I do not understand why people seek out the largest frags and colonies to trade. I do not understand why people use addatives to promote coraline growth within weeks. I do not understand why people try to stock tanks to the max after a 1 week cycle and no prior experience in reefing.
Take it slow. All in good time. It will be beautiful if you concentrate your efforts on simply maintaining stable/healthy water parameters.
You want a fast hobby full of adrenaline? -- take up RC airplanes, or downhill skiing or drag racing.