Their requirements are different than SPS/ LPS, and are somewhat more forgiving to alkalinity and calcium imperfections as they don't have calcium carbonate skeleton . They like moderate to higher flow and higher light intensity as they inhabit shallow parts of the seas.
This is mine - I’m still looking for a great spot since my upgrade last year.
The thinner areas are places where the flesh was lost by brushing up against other corals. They are very sensitive to damage but heal fast.
Back in the fluval 13.5:
I currently have grubes gorgs and I've propagated it so many times. Started with 1 and now have over 12 of them in the reef. Very forgiving and east to grow. In my experience.