Looks like there is something hanging out in my xenia frag

[Merdfrog]

My first thought was some hair algae but it looks like its got arms

 

[Merdfrog]

Moved it closer for better view

 

[ISpeakForTheSeas]

Personally, I'd guess some kind of algae, but let's see if we can't get you some other perspectives too.

 

[Kasrift]

Moved it closer for better view

Looks like algae unless you are referring to something specific other than the long waving parts.