What is this?

[Alexis56]

These neon green things keep popping out of my live rock. What are they? Are they bad? What can I do to get rid of them?



Here's a closer look:

 

[herp_mommy]

never seen that before, I would grab one with some tongs and pull!

 

[Ricksreef]

Spindle weed.

 

[Alexis56]

Okay thank you!