Will GSP grow over algae?

[Thunderrap]

I have some GSP that I'm trying to grow on the back wall of my 15gal Peninsula. It had some decent growth for a bit then seems to have stopped. I'm wondering if it's because some algae is also growing on the back wall.

 

[Lavey29]

Interesting, I have wanted to try this and curious to the answer. Wonder if it will grow over coralline to?

 

[Thunderrap]

Bump, just trying to get some answers. I’m worried about taking a scraper too close to the GSP cause it took me forever to get it to stick to the back in the first place and for it to grow as big as it has so far.