I bought the SLW-30. I have it on a 125g tank. The magnet is not strong enough. I have most of the weight on the cable, and the magnet is just enough to keep it from swaying. There was a black rubber ring in the kit that I think should have been used to change the angle, but it's pretty much useless. I doubt he can hold it even with the thinnest glass. I can say that it's virtually silent and navigates a decent amount of water despite its low profile. I can try to find a stronger magnet and see if that helps.
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