careful JJ. Adding calmag may depend on the growers water source. I have to add it and did when I used sensi bloom. I use RO water and I had cal-mag deficiencies until I added. Some folks have decent tap water with enough calcium and mag that they don't need to add. My tap runs out at 900ppm though and is the worst in the country, so it aint being used on my plants.
@BloodyBonzai, AN makes great products. But a lot of folks around here have jumped on the Blue Planet Nutrients band wagon with great success at a fraction of the cost. And they are a sponsor here, actively helping growers get their nutrient issues dialed in.
I'm sure some plants want more and some doubt, potentially. That's one reason I've enjoyed AN is because it's expensive however when you consider cal-mag isn't (apparently usually) needed it's about the same as others. At least for base nutes.
However like you said BPN is definitely the least expensive option.