Never used copper, nitrates 10, temp 79, accimlated using drip. I tested for copper and there is none. pH is between 8.1-8.25. Ammonia 0, nitrites 0 There is voltage when I take out my grounding probe, but it is unsteady and flucuates. Alos, to clarify my main tank, the one where snails just die, gets 5 gallons of water changed each week. I then filter out any particles floating in the water from the main tank and change 5 gallons from my eels tank, where the snails and urchins thrive, and put the used water in there. It is the weidest thing.