Hidden Cup Coral

I have two different colonies that came in on some live rock. Very fast growers, I started out with two polyps and now have ~15 a year later. They get some coloration on the oral disk when they get large, mostly brown & green that I've noticed. They're NPS so I keep one colony on the sand, and one is upside-down on the bottom of a shelf rock. Their tentacles are out most of the time, and will eat pretty much anything I give them. I do target feed them.
 
I have a single polyp that came in on some aquacultured rock. Seems very hardy. I rarely target-feed mine, instead relying on the current to take it leftovers when I feed the fish. It's at least partially extended most of the time.
 
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