The magnet cannot rust, it is ceramic, the most probable would be that some iron is stuck to the magnet, GFO dust is a common source and this can just be cleaned off. From the photo you are missing the rubber part of 3005.740.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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