-- UVB is fine, outdoor plants get exposed full time, big time in the Sun, right?
... symptoms are pretty generic right now, hard to make a call based on those,... P defc. is a likely candidate though (red stems are not a the best indicator, too many plants have this as normal color expression).... might be some K, Mg defc.,... first thing to figure out is the in-pot pH. that will determine what to do next... if that's off, it needs correcting first, or matters will worsen, ditto for adding nutes into that situation,.. off pH can lock out certain nutes... if you're lucky, pH will be OK and it's a simple lack-of type defc,... bloom nutes should fix that,.... What you adjust to in solution has nothing to do with what happens once in-pot, too many other influencing factors in play then! Avoid using baking soda as a pH up, too much Na in there, which is toxic at low levels,...
A great tool for in-pot pH is the Accurate 8 soil pH probe->hsoil:- long probe is the A8,... barring that, it comes down to doing the dubious run-off test; straight r-o is not an accurate measure of in-pot pH! there is an improved method and calculation here in the yellow sticky section above this one,... check it out!
Thanks for the input Waira!
I've done the run-off test in the past, but just got lazy this time around, since my ph always comes out low, and I always end up with a flush then feed anyway. So I just did that. We'll see how she responds. I went with 1/2 strength Tiger Bloom, which needed the vinegar, not the baking soda.
However, my tap water needs adjusted so have used baking soda to adjust my tap water, for straight watering.
I hadn't heard that baking soda can be toxic. What should I be using instead of baking soda?
So the soil probe you mentioned... That sounds super easy. However, I had read they were not accurate, and so should do the run-off test. Do you find the probe is accurate?
Thanks for clarifying if you get a chance.
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I have to ask, not be a tool, but are you familiar with how the pH scale works,... these comments run literally the opposite of what would be expected,...
pardon the delay mate, been a freakin' Zoo in here lately! 
haaa, business first, then you party down! .... Add Ca-Mg first always, and if you use it every time, cut to half strength since you're using tap water that has some hardness to it already,... it's the CaCO3 that's involved in pH buffering (carbonate only, actually),... then add the rest of the stuff,... Big Bloom is not a true fert' IMO, it's too weak,.. check the NPK#'s, all in the decimals,.. Tiger is the main bloom formula,...
stuff, and no real need in soil unless there's some sort of struggle with proper dosing,... usually I look at the NPK#'s and that tells me how concentrated the nutes are, and work dilution amounts from that and what the plants are telling me,... it's coco/hydro that EC/ppm is to sweat over,...
