
-- she's needing more bloom feeds! That soil is now where near rich enough to carry her well, especially now,....and look at BB more carefully... notice the NPK is all in the decimal range, very very weak. BB is great stuff, but the name is a misnomer, Tiger Bloom is what you should use, that's the base bloom nute counterpart to GrowBig,...
I'd lay off the Ca-Mg once you start nutes, unless your well water is very soft(low ppm/CaCO3 hardness)?
A little tip yellowing/browning is a pretty generic symptom, several things can cause that beside nute burn... the larger necrotic patches look like P defc. I think, need closer pics of that to be sure but most likely as it's in max' demand right now!
.... in-pot PH is something you need to start monitoring, and to do that you'll need a soil pH probe of some kind (often wrongly called meters; those are for liquids only)... The Accurate 8 (CPW) is a good unit, but the cheapo skinny probe units you see at garden centers are shit, don't bother! This more important than usual as long as you roll the dice with any Fuxfarts soils.. notoriously iffy in quality, often badly off pH right out of the bag; lousy composting/cooking, , garbage sticks, stones, even bugs... there are better soils for little more $, worth every extra dime IMO,...