I've been using the BMO stuff for a couple of years and I agree, cal-mag is needed throughout the grow. I use 5 ml per gallon of cal-mag, every other week with my gig or fp, and all my girls like it. I also have experimented with up'n the recommended mixing doses. One extra teaspoon (5 ml) per gallon of water, of either gig or fp does not cause issues, and helps fatten up my ladies. I've done this on most of the strains I've grown, and only burned the tips on a real sensitive blueberry strain. Other than that, cal-mag and up'n the doses has worked for me.