I have one on 3/8 glass and I havent had a problem but on the half inch glass my rabbit can flip his tail and knock it off the glass. However its been on the tank for 3 months and I have only had it fall twice because of the fish. When I added the maxi mod I spent a couple of hours making it work, the maxi keep blowing the K4 off the glass. Along with the magnet is a suction cup and between the two, do an ok job. Could be better but......
Scott
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