Again. What is this? Two tentacles (video)

[DothanReefer]

someone please tell me what this is? I've found a few of them around my reef. This is the best video I've gotten so far. Please take a look and let me know if youve ever seen this?! And of course if so, what is it!?!?

YouTube video:
Video of snail hitchhiker - click here

 

[Dragon52]

#reefsquad

 

[DothanReefer]

#reefsquad

Thanks! Please help #reefsqaud

 

[KJ]

Spionid worm.

 

[vsolovyev]

It’s looks like a couple tentacles from a brittle sea star, I have miniature one like that all over my tank, may also be spionid worms.

 

[DothanReefer]

It’s looks like a couple tentacles from a brittle sea star, I have miniature one like that all over my tank, may also be spionid worms.

Thanks for the quick response!

Are either of these things "bad" or will they cause problems with corals/fish/inverts?