Hey guys,
I'm not sure why your supposed to add micro first but this is from Advanced Nutrients web site-- "When using Micro as part of our Grow Micro Bloom three-part feeding program, we recommend a 1:1:1 ratio. However, you can always take advantage of the program's flexibility by using a 1:2:3 ratio or a 3:2:1 ratio if that's what you're more comfortable with. We encourage you to experiment and decide on the best ratio for your needs, based on your own conclusions. Keep in mind that Micro should always be added to your reservoir first, followed by Grow, and then Bloom." --- If anyone has a definitive answer to why you are supposed to mix it first I would love to hear it.

Abyss