Are these hydroids?

[Schulks]

These white tube things?? Should I just toss the live rock? it was like 50 bucks
If these are hydroids, Will they have already spread to my non- Live rock? This rock is in my sump not touching any other rocks. It has been there 2-3 weeks. I have no clue about these things lol

I do have another piece of LR I put into my display but it is mostly buried. Should I pull that one out too?

 

[Troylee]

Hard to tell in those pink pictures.. the bottom photo almost looks like feather dusters. Does a fan ever pop out and go back in when spooked? If so it’s a duster.. hydroids don’t really retract the same way

 

[Schulks]

Sorry it is in my sump and it was either pink or black lol
I'll get a better picture.

 

[Schulks]

In this picture there is a fan on the end and then I tapped the acrylic on accident and it is no longer there! so seems like they may be feather dusters!

But there is a lot of other white tubes around this rock. Some are much smaller and hard to see. I don't know if thats typical feather duster stuff.

 

[Schulks]

If I sneak up on them I see a lot more fans. Super cool!

 

[scottkoji]

Those are tube worms/feathers not hydroids. Digitate hydroids (what I think you're referencing) look more like thin white strings hanging off rocks with tiny tufts closer to the tips.

 

[Troylee]

Cool hitch hiker and safe! Hydroids are normally short and straight.. colonial hydroids look like yellow polyps.. digitate are like white strings and don’t retract