What is it?

[Apotack]

White/clear tentacles left of the center. Interesting creature, it pulls in one tentacle at a time, in what seems to be a pattern, I assume to eat anything it’s caught.

 

[Lovemyreef2015]

Looks like a sea cuke (cucumber)to me. Harmless filter feeder.

 

[Gareth elliott]

ctenophore (comb jelly) perhaps or colonial hydroids not great at discerning with the blue light.

 

[Apotack]

I lives in a hole in the rock if that helps with the id

 

[Lovemyreef2015]

This is what a sea cuke looks like when in your rock work. Does it look similar to this?

 

[Apotack]

Aside from the color it’s similar I haven’t been able to see a mouth yet due to the viewing angle