I was going nuts trying to clean my the glass in my BioCube. It's curved, which makes it hard, but it was also getting calcified green algae, which was hard to remove. Neither the mag float nor the steel Kent scraper were doing it. I went to the hardware store for single-edge blades and instead found this. It takes a Stanley knife blades, and this thing kicks ass! Algae problems managed. It was only $8 at my local HW store, so check there first.
https://www.amazon.com/gp/product/B...beb-4819111bef9a&pf_rd_r=X5S2CWXS33ZYT7CYC1WM
https://www.amazon.com/gp/product/B...beb-4819111bef9a&pf_rd_r=X5S2CWXS33ZYT7CYC1WM
