SPS on rusty rock magnet help!!

[Boboe77]

I have a sunset montipora with a setosa a montipora on a rock mag. I noticed today that the magnet glued to the rock is really rusty, I looked at the magnet on the other side of the glass (in the built in filter) and it extremely rusty!! What can I do? The sunset montipora is already encrusted the rock. Help!!

 

[trido]

Can you break the magnet out of the back and put the rock on the sand bed? If not, I'd suggest busting it up with a hammer and chisel and save as many frags as you can. I'm not sure how harmful rust even is to a reef tank. It adding oxidized minerals to the water. The question is, how much and what kind.