Coralline vs other algae

[mrbluewildcats]

7 months in and I'm starting to get quite a few small spots of coralline growing. It looks like it's coming in under the GHA in places (I'm guessing it's GHA, it's been on the back of the tank for quite a while). Will scraping the GHA off the back have any effect on helping the coralline grow more quickly? If it grows underneath the GHA like this, I'm guessing the coralline will kill the GHA off as it spreads. Is this correct?

 

[X-37B]

I had similar issue at around 3 months in.
Dosed Vibrant for 6 weeks and now this is the back of my tank at 8 months.
Once the coralline takes of the gha will be reduced imo.
I just took this pic as lights are still off.