Are these hydroids?

[WalkerLoves_TheOcean]

Just found these on my glass, they are tiny.

I have had live rock from and established tank for a month now, and just noticed these on the glass.

Sorry for the bad pictures, but they are so small.

 

[crazyfishmom]

Yes. Definitely hydroids.

 

[vetteguy53081]

Just found these on my glass, they are tiny.

I have had live rock from and established tank for a month now, and just noticed these on the glass.

Sorry for the bad pictures, but they are so small.

Pic very dark but appears to be. If on glass, hydrozoans and can be scraped off into net abd discarded