Green slime stuff

[KillerKlownFish]

I have this green stuff growing on some rock how do I get rid of it?

 

[cloak]

If it comes off the rocks with ease then it's probably just Cyanobacteria. (blue/green)

http://www.reefcleaners.org/nuisance-algae-id-guide

 

[KillerKlownFish]

Thanks been scrubbing a bit every water change.