Just the usual. All evaporation water is kalk replaced and I run a large single stage
calcium reactor.
The lighting helped I think. It started to really grow under the 400w Radium/pulse start combos. {at least they grow something,

}. I also added 4-110w vho bulbs for awile, which really seemed to promote it.
Just running
Iwasaki bulbs and normal actinics now, so will see how it progresses.
In a smaller tank, I still find one of the two part supplements, {I prefer C-Balance or B-Ionic}, to be one of the best coralline promoters.