Does anyone know what this is? Friend or foe?

[Girlingtonblue]

Hi,

I've been cycling my tank and decided to take the towel off and turn the lights on. I found this inhabitant growing on the live rock. I also spotted two others.
It is opening and closing (very cool). Do I need to worry about this or is it okay? Looks like a type of polyp?

 

[Johnnybgood74]

I'd guess a feather duster

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[Paul n]

Just a little fan worm harmless filter feeder

 

[Ejb]

Type of filter feeder, friendly

 

[clowncaldy27]

Friend , filter feeder ; feather duster

 

[mcgyvr]

You might want to bookmark and skim through this to see the common "critters",etc.. that are very common in our tanks..
https://www.lionfishlair.com/hitchhikers-guide/

pineapple sponges, feather dusters, spirorbid worms , aiptasia, vermetid snails, amphipods, copepods.. all very normal and very common along with many others on that page..


and yes.. what you have is a feather duster.. totally safe and beneficial filter feeder..