I read that post the other day
Per the instructions on the bottle of coppersafe it says 1.5-2.0.
My API test kit measures from 0.0, 0.25, 0.50, 1.0, 2.0, 4.0.
Therfore how would I read 2.5. ANd the color difference between 2.0 and 4.0 is big
Not tring to argue just trying to get my fish healthy