Ok, so I have been waiting on my Hanna Copper checker, and when I got a new batch of fish, I dosed 2.5ml/4 gallons of coppersafe (I dosed 7ml total in 17.5 gallons). Turns out that was 1.35 ppm.
How do I calculate how much I need to add to get to 1.75ppm?
How do I calculate how much I need to add to get to 1.75ppm?




