Pests on Hammer?

[panamaembraced]

I noticed this on my hammer coral, I have no idea what it is. You can see it just below the ridge. Any suggestions? Help would be greatly appreciated.

[panamaembraced]

Here's a close up. You can't really see it, but there seems to be a green spot; same green as the coral; in the center of the thingies.

[OctoRock]

Im no expert, but it looks like a kind of nudibranch i saw here a while back.

[enrico]

Do they move?

[EricHugo]

I can't see much of anything.

[enrico]

If I'm not wrong he is talking about the new polyps that are growing... I can see nothing more there... This was the reason I asked if they move...

[panamaembraced]

They appear to move, but I can't tell for sure. If they do, it's very slow.