Please ID these algae

[LaurentSeattle]

Here is a red one:

And a green one:

Good ??? Bad ???
Preserve ??? Eradicate ???

Thanks a lot!

 

[malsavant]

I've seen those before, I'm not sure if they are true macroalgae but I know that they can grow quite fast. If you like the look, keep them if not I would suggest pruning them now.