Hitchhiker ID please.

[Just John]

These are growing on some gulf live rock. They are tiny to small grey patches with very long feeder tentacles. Sorry about the low quality photos.

 

[EricR]

Pictures are pretty blurry (to me).
Tubes visible in first picture could be vermetid snails.

 

[JoJosReef]

Also having a hard time making out the structure of the grey patches.

 

[ISpeakForTheSeas]

Those are benthic ctenophores (benthic comb jellies).

 

[Just John]

Those are benthic ctenophores (benthic comb jellies).

Looked on line and that's definitely what they are. Thanks!