Scraper is strong. I will give But that's way too small for my 65 gallons. And the blade started rusting after two months. The blade isn't that sharp either, so it just doesn't do the job. If you have a glass aquarium, buy a piranha float. That's great! I just got this portable device to use in the back of my tank where I can't get with a magnetic scraper. Overall, I really didn't like this Seachem scraper.
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