At first I couldn't get over the price of this item. So much money for fancy magnets! But then I got a 120g tank with 1/2 inch thick glass and I needed something strong enough to clean the glass. I finally gave in and tried it after seeing all the positive reviews. As mentioned, this magnet is no joke, it's insanely strong. I throw it in my fish tank and it takes almost no time to clean 3 sides of the 120g tank as the magnet is so strong. That being said, algae free (AG) magnet cleaners are a reasonable size and you don't have to make the magnet bigger or smaller. AG produces 4 sizes. Piranha for 1/4" - 3/8" tank, Hammerhead Shark for 1/2" - 5/8" tank, The Tiger Shark for 5/8" tank. 8 is for 3/4" thick tanks and Great White is for 3/4" to 1" thick tanks. The air purifier also comes with replaceable/removable pads. The tree size has a super smooth velvet pad to protect the outside of the tank. The plastic interior has the option of an acrylic or glass liner. There was an extra pad for each pad in the packaging which was nice. Don't keep it magnet in the tank all the time (accumulation of corrals/dirt which can then scratch the tank when cleaning) who cares how nice it looks?
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