Any idea what these clear tentacles are?

[bound2falling]

I'm quite concerned, seems to have came in on some frags.

 

[DrkNMighty]

Looks like the tentacles/sweepers from the coral.

 

[bound2falling]

Looks like the tentacles/sweepers from the coral.

I got these frags from a misc discount bin so I actually dont know what they are but they didn't have the tentacles for a month only this week did they show up

 

[DrkNMighty]

Hard to tell from the videos, is it coming out of the coral or from under the frag?

 

[bound2falling]

Hard to tell from the videos, is it coming out of the coral or from under the frag?

Underneath