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coralline generally is a medium to low light growth, tends to grow slowly in more intense light, phosphates inhibit coralline growth as well. DKH is decent but bringing it up closer to 11 DKH might help because without the carbonates coraline has a harder time calcifying.
same with calcium it's good within reef parameters but pushing that up just a bit to 450 may help.
Too scraping coraline into a high flow area to seed the tank helps a lot. and depending on what species you have in the tank already, it has to come from somewhere. so you need a source if your rocks have zero the only source you have is whatever is on frag plugs etc, so it's best to get a rock from some one that has a lot and frequently scrub the rock to speed seed the tank.
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