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If I remember correctly, they are ferrite magnets. The bond is weaker than their original magnet which I don't like, but in any case, they are not supposed to rust. You can confirm with Roger from Tunze.
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No man is an island entire of itself; any man's death diminishes me, because I am involved in mankind; never send to know for whom the bell tolls; it tolls for thee.
John Donne
Current Tank Info: 120g Reef 100g Rubbermaid Sump, 20g Refugium; previous tank: 46g Drilled; Self Plumbed, Birds Nest, Anchor, Xenia, Zoas, Yuma Yuma Ricordea, Chalice, Mushrooms, Brain, Acan, Anenome Plate; Clams, Other Inverts, Fish, Live Rock
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