Coralline Scraping

[HTXReefer]

So my tank is almost 8 months old and I’m starting to get coralline growth. I have a 72 bowfront and don’t mind it being on the sides and back glass. I have tried to scrape it with my mag float on the main curved glass but it won’t touch it. Is there a trick to cleaning the curved glass. Should I get a plastic putty knife and remove it that way?

 

[Mr.Guns]

I have used old credit cards to do it. Works great, it's just a wet job.
I have a mag float with the scraper attatchment now.

 

[homer1475]

Flipper magnet cleaner. One side has a blade for scraping and will remove coralline on curved glass. While I still use one, when I had my biocube(curved glass), the mini flipper was the only thing that would take the coralline off the front glass.