Id Please. Duster - Aiptasia - Robot?

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This guy has been in my zoa colony for months. It hasn't gotten much bigger since I first noticed it.
It doesn't seem featherly enough to be a duster or tentacle-ly enough to be an aiptasia.
Whats weird is when it closes it's arms they don't withdraw in. They fold up like a tripod.

 

[coraljunky]

IMO, duster

 

[worldwide zoo]

Duster for sure. They'll be everywhere before you know. I think it's a good thing.

 

[coraljunky]

Originally Posted by Worldwide Zoo
Duster for sure. They'll be everywhere before you know. I think it's a good thing.
Hows the saltlife since the tank leak?

 

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I'm not 100% sure its a duster. I have hundreds of little dusters everywhere already and not one looks like this.

 

[coraljunky]

Here are some that look similar. They are dusters.

 

[npage]

Thanks for the pict.
Shouldn't a duster retract into its tube when it hides?
This closes its arms like if you brought your fingers and your thumb together.