I have several of these for different tank sizes. I think the product is amazing but my only complaint is that I'm having a hard time figuring out which size fits which tank. I have a 75 gallon large and a 120 gallon extra large - both great! I got this medium for my 40 gallon and found that the strength of the magnet leaves a lot to be desired - the two pieces separate too easily resulting in having to reach and grab the other piece a few times while brushing or move very slowly. Size Medium is good for 40B. But in terms of strength, I had to go big.
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