Food. Animals like to eat.
There are some really good options out there, but I hit tanks with Reef Nutrition ArctiPods, ROE, Oyster Feast, Roti Feast, and Phyto Feast at least 3x/wk. Something for everybody (including the fish). If alk and Ca+ is good, corals grow like crazy.
I posted this pic in the LPS forum, but here’s a tank that I do that has a forest of frogspawn. These 4 colonies came from a single 6-7 head colony. There’s an auto-feeder right above that drops pellets in and a lot of them land on the coral. It prob took 3 1/2 years to go from a 6 polyp colony to these guys: