entering week 3 of flower , this one plant is cons...

looks like calcium to me with the leaf spotting and I'd think it would have plenty of N given the other growth looks overfed. I also see slight tip burn on some of the top foliage. I think you might be having issues with PH in that one pot. A good feed, even if its outside the ideal ratios will be fine for the plant and buildup won't happen if you get some runoff. but like ballpark range. 20-20-20 can work, were as 2-40-40 would not. I would check your PH and EC if you have not already and make a decision from there. also review the amounts of N-P-K and Ca-S-Mg it is getting from your feeds, should be on the labels, these things are also knowen as its macros and secondary macro elements. does not look like a micro issue at all so I would not worry about that.