Coralline algae "problem"

Mattyice008

Reefing newb
So I've been using Purple Up to try and speed up the growth of coralline algae in my tank, and trust me it worked. It's growing on the rocks very rapidly.
But my problem is on the glass. It's spread all over the glass, mainly on the back of the tank. I'm afraid of it taking over, and I can't scrub it off with anything.
Any ideas?
 
See what I mean about the purple plague? :wink:
Coralline can be just as bad as any of the algae when it gets outta hand.
 
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