Please help identify long tenticle starfish

[SammyL]

I was performing a water change yesterday and when I looked at my syphon tube I thought it had a crack in it. Upon further inspection I noticed several of these small star fish that I obviously syphoned up from my substrate.

A little research and I believe they are Ophiuroidea and I have no idea where they could have come from. I have not introduced anything into the tank in over 6 months and I mean nothing besides water changes and dosing.

Am I good here with these little guys?

 

[Calappidae]

Micro brittles, common beneficial hitch hikers in live rock.

 

[SoloGarth]

Yes mini brittle stars. Major part of my cleanup crew.

 

[Betta132]

Micro brittles. They're good guys, they get into tiny gaps and eat gunk. You probably have quite a few hiding in your rockwork.

 

[SammyL]

Thank you for your quick replies.