I have a 29 gallon rectangle tank and I bought the smallest size this seller has and its a good size for the tank. If you had a larger tank I would go up a size. I checked the pads over closely before using to make sure there were no sharp spots so I did not scratch the tank. (none were on it) the outside piece is nice and soft and the inside piece feels like the pokier side of loop Velcro. I was a little worried about the inside scratching but it did not. The magnet was strong and I could get it to attach from a few inches away so it should work well with most smaller glass thicknesses. The inside piece also floats so if you try turning the corner it just floats to the top. This did clean about 90% of the junk on the glass. so I was happy. It will not get into tight spaces like around heaters or filters so you will have to scrub those by hand or mover the obstacle but worth the money. I have only used once so far so I will rate again as to how it holds up later.
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