For what it's worth, copper very well could have an impact on ammonia testing depending on the products used, i.e. Seachem I believe. If performing 50% water changes daily (siphoning waste and uneaten food) ammonia shouldn't be an issue unless you overstock your QT. In a QT you are trying to avoid cycling due to the medications involved. As far as copper, it is fairly simple to dose: For instance, your target should be 0.18mg/L of copper sulfate. In theory, if you perform a 50% water change then you would need to redose at half the original dosage, 0.09. Of course, you would need to perform a copper test prior to any dosing. To calculate dosage after a water change, take the number of gallons, we'll use 20g, and multiply by 3.785 multiplied by the difference between your target and what your test yields. Example: Gallons=20. Target=0.18mg/l. 50% water change=0.09mg/l. Take 20x3.785=75.7x0.09=6.813. Your dosage after a 50% water change would be 6.813ml (Either dose 7ml or 6.5ml). Hope I got that right lol. Hyposalinity is a longer approach, not guaranteed to kill crypt., and accelerates Uronema. I rather battle ich than Uronema. If dosing copper properly, it is a more thorough and easier process than hypo ime.