tube worms all in my sand?

[jonsbabykake]

i sucked up a bit of algae today off my sand bed and exposed 100s of these little tubes that are in the sand. i dont really see anything popping out of them and they dont retract when touched. this is a bad photo...

are these little tube worms?

 

[yote]

Looks more like the start of cyano to me.

 

[jonsbabykake]

these were under regular green hair algae..the cyano i sucked up didnt have these under it so hmmm..its an aerial shot so it looks like dots but theyre tube structures. i have a better picture from my underwater camera i stuck in there but i dont have the proper media outlet for it lol

 

[Zissou]

Probably just tube worms. I've had a few cut open my gloves while rubbing algae off of rock with my fingers.