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You want to dose according to package initially and then monitor. Is not that you dont have to re-dose but you dont need to keep adding as this is a chelated form of copper. Copper power is considered therapeutic at a Cu Level of 1.5ppm which is the minimum strength and 2.25 max. I generally compromise and dose at 1.75-1.85.( 1ml per gallon should get you there).
Regular testing is an absolute necessity. Dont bypass this step. lastly, when dosing copper of any form, add oxygen as copper will reduce oxygen levels slightly.
That is outdated dosing. Humblefish recommends 2.5ppm now.