Thing works really well but I think the magnet could be a little stronger. But I also have a large 150 gallon tank and the glass is very thick. If you move too fast he will start jumping. The scraper is also very nice. It didn't take long to wash the glass. The pad that cleans the glass is just the rough side of the velcro, so it's pretty abrasive. I've only used it once so far, let's see how it does with the glass. In addition, the part that is in the tank floats. So if you lose him, he just swims up. I have a big one and it's quite big
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