573 Magna Scraper Magnetic razor blade scraper for glass aquariums. PennPlax. Takes on tough calcareous algaes that velcro scrubbers leave behind. Will scratch glass tanks if care is not used. Clean slowly and easily and it is safe enough for the tank. Razor blades embedded in plastic coated magnetic holder. Safer for humans than a long handled blade scraper. Have a net handy if you drop it, but I still use these on some of my tanks where tough algaes are present.

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