Neptune Aquatics

Algae scraper blades

I wouldn't take the risk unless you're a pro sharpener. . If blade result is uneven, you'll scratch the glass.
 
Plus they are intentionally not actually sharp, at least the ones I’ve used. More like a credit card edge. For scraping, not cutting.
 
I think it depends on what the blades are made of.
Are you talking about the plastic or metal ones?
I think you can sharpen a credit card edge and make it more effective once the edge gets rounded.
 
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