We all need them, whats your favorite? I've gone through a few, eventually they snap. Never been a fan of the magnetic ones in the past but I could probably be swayed.
Throw your magnets in the garbage. BY FAR, the- BEST algae scraper I have ever used is the Eheim Power Cleaner Battery Operated Algae Scraper. Goes through the toughest coraline, or any other type, like buttahhhh!!!!