help with "sick" short tentacle plate coral?

[bdock26]

hello,
i've had my tank up for about 4 months now, 92g with 195W T-5. All my water parameters are good. I have a purple gorgonian, brain coral, and some zoos that are doing great. I was moving some things around and dropped a small rock that landed on the edge of the plate coral -- it closed up but actually looked ok after a few days. But it hasn't extended its tentacles since then, and now has what look like pods but tinier "bugs" hopping around all over it. I just saw it spew out some slime as well.
I'm not sure what to do? Are the "bugs" the problem? Or is it dead and they are just scavenging it? Thanks if you can help me with this.