is this algae? what kind?

[nanoreefking]

Hey guys,
Does anyone know what kind of algae this is, if it is? Kinda looks like a bryopsis but I don't think it is because it has a feather of some sort that sticks at at the tip and it's a bit skinnier than bryopsis.

 

[Tahoe61]

Hydroids

 

[nanoreefking]

Hydroids

Do you know how to kill them?

 

[Tahoe61]

Unfortunately no.

I am sure someone else will chime in though.