does FNB absolutely, positively have 100% of all ingredients a healthy plant needs?
Yes, so does 0-8-16, so does PBP plus Cal Mag. In fact there are even people whose plants are happy with nothing but PBP, to my amazement.. as discussed in the calculating nutrients thread
Yes, there is absolutely nothing in any of the additives that a plant cannot live without, IF YOU USE FULL strength nutes.
If you screw with 50% of this and that... youre back to needing additives