I think people put too much emphasis on nutrient brands. They all contain basically the same things excluding the differences between organic and synthetic.
Years ago I went through the nutrient nonsense. I was chasing brands thinking the next one was better. I was wrong. I used Botanicare, GH, and a couple others before I realized that I didn't need them and they were extremely overpriced. I went to an inexpensive dry nutrient similar to Jacks or Masterblend that contains everything a plant needs and haven't looked back. I never have any nutrient related issues. I've been using the cheap nutrients for years with no added additives and my plants always grow great. I even grow in coco and never have the need for CalMag although many say you need it when growing in coco.
I see people using a dozen bottles of concoctions that they have to mix up at different rates for each week. It's ridiculous and not necessary. If there is one thing to say about the cannabis specific nutrient industry is they have top notch marketing people pushing their products. But once you realize that they spend more on marketing and packaging than they do on what's actually in their bottles you move on if you understand basic plant science and that you don't need any of those shiny bottles of products with cool sounding names.
I can grow just as good of weed with a couple dollars worth of a micronutient blend, calcium nitrate, and a little MKP in flower as those using these dozen bottle lineups with some ridiculous feeding chart to follow. If cannabis specific nutrients are so great then why are so many people constantly having issues and needing things like CalMag when those things should already be in any decent base nutrients.
I rarely see anyone using Jacks having issues. But the Marijuana Problems section is full of people paying top dollar for Advanced Nutrients, Fox Farms, and many other nutrients targeted towards cannabis growers.
I know my post is likely falling mainly on deaf ears and I understand that some think cannabis requires all these special products but it doesn't.