Should I be worried about these tube like things?

[nathan212178]

I just noticed these groups of small short clear like tubes with a head, it looks like a Xenia in the sense of it’s form but I’m not sure, I just noticed these under a rock and took a pic under the light, there’s no bioload since it’s a semi new tank. I’m not sure if I should use panecur since I have it on hand or leave it as is. It’s only on this one rock to my knowledge

 

[Ranjib]

im not 100% sure, but i think those are hydroid. I would not be worried. It looks like the tank is new. its typical in new tank

 

[EeyoreIsMySpiritAnimal]

Might be ball anemones (not true anemones, actually corallimorphs).
If so, they are harmless and really cool