I thought the metal toxin might be coming from your pump, heater or maybe a protected wire mesh covering.

I do know that my water temp was 62 - 64 though out my ordeal, not nearly as warm as I would like it. But the best that I could do, I did add a small amount of "API Stress Zyme+"

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I HAVE NOT FAILED. I'VE JUST FOUND 10,000 WAYS THAT WON'T WORK. Thomas A Edison