Does anyone know what pest this is?

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I saw this pest under my ricordea and was wondering what kind of pest is this and should i be alarmed?

I got this coral last night and did a dip using coral rx. The pics are below

 

[redfishbluefish]

Not sure of your magnification and it's a bit fuzzy, but think it might be a feather duster. If you touch it, does it immediately retract into a tube?

 

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Not sure of your magnification and it's a bit fuzzy, but think it might be a feather duster. If you touch it, does it immediately retract into a tube?

I did not touch it yet but i dropped something earlier and shaked the stand a bit and it went back in to the rock,

 

[Goaway]

To me, looks like a feather duster. They wont do anything.

 

[Heatherhigg]

I agree with the comments above, I think it’s a feather duster but better pictures would help.