I had 3 TLF tiny mag cleaners rust,after that I will never leave a magnet cleaner in my tank. Thankfully I keep pico's so I can use a toothbrush
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I use the tunze magnet cleaner, stays in the tank 24/7. My trochus snails love to hang out on it and clean it, so no need to come out. If not I would probably clean it every month or so.