Formula
delta=target-current; liters=volume*3.785411784; activeMg=delta*liters; productG=activeMg/1000/(strength/100)
Percent inputs are divided by 100 in the calculation. Unit conversions are shown in the results where applicable.
What the result means
The result converts a desired concentration increase into active nutrient mass, then adjusts for product strength. It does not account for biological uptake, precipitation, or nutrients already added through feed.
Dose conservatively, verify the product label, protect fish and biofilters, and retest before adding more.