It's built well and the magnet is strong in my 75 gallon glass aquarium. This thing didn't damage anything but for the price I expected alot more. It leaves a very streaky finish on the inside of the tank where it's dirty. It misses alot of the build-up because of it's velcro scrubbing, so lines that it didn't clean get left and going back over them doesn't do much. A simple rag I use just for my aquarium can clean 100x better guess I'll stick to that method it's worked for 20 years already.
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