What’s all this fuzzy stuff?

[Stblindtiger]

Can anyone help me identify what all this white fuzzy stuff on my rock work is, whether or not it’s harmful, and how do I get rid of it?

Thanks!

 

[Dan_P]

Can anyone help me identify what all this white fuzzy stuff on my rock work is, whether or not it’s harmful, and how do I get rid of it?

Thanks!

Might be an alga. This looks like a new aquarium.

 

[Stblindtiger]

Might be an alga. This looks like a new aquarium.

It’s a year and two months old.