What is this on my glass

[Max H.]

This just showed up on my glass and I’m not sure what it is. Could someone help identify it.

 

[vetteguy53081]

Spirobid worms. Although they appear in numbers are harmless
I generally removed with edge of an old credit card and scrape into net and discard

 

[Max H.]

Spirobid worms. Although they appear in numbers are harmless
I generally removed with edge of an old credit card and scrape into net and discard

I was talking about the red branch thing in the middle. I couldn’t get the greatest picture

 

[Max H.]

Bump

 

[vetteguy53081]

Red ogo macro algae