Bought this to clean my 10 gallon glass tank while cycling. I use the fish feeding method in my aquariums without fish. Because of this I get some algae growth as it takes months to cycle this way. I would say this is a pretty good product. It takes a lot of rubbing to remove some of the algae, but it doesn't scratch the glass and it holds up well. One note though, I can't speak to the durability of this scraper as once my tank was cycled I put fish and slug algae in it which saved me the need for such long use. I will say that this is not very good for cleaning glass from Nerite snail eggs. I tried it once and it was an unsuccessful effort.
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