FYI: that huge cabbage leather is a sinularia dura, they contain and release terpines wich can be detrimental to the growth of many SPS and LPS up to and including death, usually just stunting growth. running carbon and doing plenty of water changes can help defray those effects.
some of the SPS/LPS most effected by the terpines are: Acropora, Cataphyllia, Euphyllia, Pleregyra, and Porites.
others in the sinularia family do the same, I justy wanted to give you a heads up on that.