absolutely not. Blindly following the calculator or thinking that every plant needs more than 5g/gal eventually, can be folly. You have to carefully read and understand what GLN says about fine tuning your dosage to the perfect green color. Once you find the level that your plants need, the specially designed GLN supplements seem to be safe to use.... as long as you use them each at the correct time for the plant to be able to utilize what they provide, and as long as you treat them like dynamite... a little goes a long long ways. Heed the warning that they have added their calmag supplement into the base megacrop product, and trust that if you are at the perfect "megacrop green", you are not only giving the correct amount of Nitrogen, but also Calcium and Magnesium. It seems that only the hydro/LED folks are finding a need for extra magnesium.
I have found that while you are in veg, the Sea-K product is very good for helping to develop roots. It should end at the flip, when a hit of Sweet Candy seems helpful... but go lightly. When stretch is over and the buds are really starting to develop, Bud Explosion BE can be started, again going slowly and respecting its power.
I am finding in my soil grow that I have no need to adjust pH or worry about the chlorine in my tap water.
Again, going for the proper green I found that contrary to the advice I was hearing on the forums, as well as that big 6g/g upper limit on the online feeding calculator that seemed like some sort of goal, I found that my very large plants in 5 gallon containers of soil don't need more than 4.5g/g of MC. Once I figured that out, ... well, you see the result.