I bought this product after reading 2 or 3 reviews. We have 150 gallons and some tough seaweed! We had a slightly smaller size and the magnet wasn't strong enough to really clean. It got rid of all the hard algae as soon as we put it in there. (with some fat of course) You have to be careful how you put it on the glass, it breaks very hard so watch your fingers! We also have that for you with a scraper. It works great without, we were just afraid of scratching the glass.
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