Found mini volcanoes on my live rock?!

[ziqex]

Hi I got some live rock to help my tank cycle, its been a week and I just notices some movement on the rock. Can someone help ID this? It looks like mini volcanoes and shrivels up when touched.

 

[Gumbies R Us]

@ISpeakForTheSeas

 

[stE26wy14]

can u post a photo here or video to yt plz, a lot of people cannot view embedded videos

 

[AlyciaMarie Verified Admin]

It looks like a feather duster is to the left of what you're focused on. I'm thinking that could be one as well. If that's the case, harmless filter feeders.

Does whatever moving inside of it look like that duster? Could also be a barnacle.