What is this thing ?????

[Unclebob]

Ever now and then I see a long purple leg with an orange tip stick out from my live rock then it goes back in. Just curious as to what it belongs to. Is it a worm ? A starfish ? Who knows, not me. I never bought either of those things.

 

[crister13]

We kinda need a pic. Really hard to tell without one.

 

[Keithhjs]

Without a pic it sounds like a bristle worm IMHO.