I bought this to replace a proprietary magnet that had been left in the water for too long. The thing barely holds up and my glass isn't particularly thick. I have a Biocube32 and bought a small one. When I tried to clean the glass it fell about half a dozen times and I had to chase it down. After all, he swims, which is one of his virtues, otherwise I would crush my corals and gobies. I moved fairly slowly, using up/down, sideways, and circular motions. Whatever, kept popping up.
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