Review on Jasonwell Magnetic Aquarium Fish Tank Glass Algae Cleaner - Floating Brush (L Size) by Montez Parson

Does exactly what it says it does. It's a magnetic algae scraper. It's tough but didnt scratch my glass. I had hair algae growing in one wall of the tank, a thick layer of it too. Busted right through it. I will say to use caution near the edges of the tank. Its heavy and the magnets are strong. It didnt happen, but I could easily see it happening. Its strong and heavy, if you hit the side too hard I would imagine it would be the equivalent of smacking a rock on the glass. It's a very strong magnet. It would be really good if you have a thick glass. I wouldn't recommend it in a nano tank tho it's pretty big. At least the one I ordered is big. It got the job done though, swiftly and efficiently. Ice recommended it to 2 people now. With caution about the strength of the magnets. Dont smack your corners with it. That's all.