Thanks for the reply... I'm beginning to suspect the anemones to be Aiptasia as well, though I generally see them brown to tan in pictures and I understand they are nocturnal? These guys close up when the lights go out.
The stony coral in the second pic does look somewhat like a sun coral, but the largest polyp is only ~4 mm across. Maybe I'll try target feeding them and see if I can get them to grow, thanks for the idea
I think these guys close at night also, I'll check tonight after lights out.
Of course, they are pretty close to the tentatively labelled Aiptasia, so maybe I won't start feeding until I've decided what the anemones are and dealt with them (or not).