While the directions of 3-5 mL are recommended Cal mag dosage on the label, if you’re using it as a preventative measure (rather than correcting an existing problem) then you can go with a weaker ratio such as 1 mL per gallon in soil and coco grows.
Week three for the trio suggests using 1/2 tsp FloraMicro , 1/2 tsp FloraGro , and 1/4 tsp of FloraBloom
Sorry it's not in ml.. Hope this helps my friend! Happy growing! 👊