I second the Copper Power, and Hanna Colorimeter for checking the Copper. Also it helps, to mark the glass on the Aquarium at the water levels and gallons. I have mine marked at Full, 10% 20% 25% and 50% water change. I do change the water, during treatment, replacing with water from my display.That way I know exactly how much Copper Power I need to replenish. I have a small clear funnel, and I put the Reagent in the Curvet first, it’s easy to spill the powdered reagent. Then measure the Tank water in with a Syringe. Also I keep alcohol wipes, in the kit to clean finger prints off of the Curvet.
