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Copper? I once had a pump that was for fresh water. It has a brass seal that has copper. I was doing 25G water changes twice a week for 6 months before I found the problem. You could have a wire cut and if it was the neutral or ground you wouldn't get voltage in the tank to know. My tank would perk up for a day after each water change but then the next day would start to go to poo.
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