the formula isn't that bad once you get it.

I dont use the micro and the bloom mix because floranova bloom is micro and bloom already mixed (use the micro # as the FNB #)

((target - current) / target) * 8 ml per gallon * res gallons = FNB (ml)

an example is I have a 30 gallon setup that the nutes are at 920 and I want to put them at 1250

here's the math:
1250 - 920 / 1250 x 8 x 30 = 63.36 ML FNB

1250 - 920 = 330
330...