Coraline algae on acrylic

[Myka]

Urchins eat coralline algae, but not enough to keep the glass totally clean. I find most tools designed to clean acrylic tanks suck at their job. The Kent scrapers with the plastic blades suck. I tried one on my glass tank and the plastic blade doesn't seem to be flat enough because it won't even clear the soft film off the glass in a clean sweep. I have the long handled Kent scraper, maybe with a short handled one a person could apply more pressure and have it work better...?