I have the scrapper...
This one...
http://www.amazon.com/KollerCraft-Al...=algae+scraper
already somehow got a tiny scratch on the glass...so been trying to avoid using it...even with the razor edge...
i find the magic eraser has been the best thing for glass and acrylic...have not scratched yet and removes really hard stubborn algae...just don't want to have to climb a ladder to get down there...its like 30" deep to the substrate and another 32" on the stand....lol
and i thought i have long arms but its still a pita!
tried rubber banding the magic eraser to an acrylic rod but not strong enough it slips and slides...against the glass..and doesn't help that it has euro bracing even harder at an angle...hahahaha