[eeyore1954]

Yesterday I picked up one of the rocks in my tank and underneath it was a black spindly fuzzy creature with 8 legs or tentacles? It slunk/swam under another rock. It had a diameter of about 3 inches the (legs) were very skinny , fuzzy and I think there were 8 of them. Any clues about what this might be be? Don't know where it went now but it is lurking in there.

 

[Loverotties]

Brittle star?

 

[eeyore1954]

Thank you I searched and found apicture of a black one in wikipedia that looks a lot like what we saw. I guess it didn't have 8 appendages only five.
Once again thank you i think that is it.

 

[Newbie-Reefer]

I second that, it was a bristle.