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bit odd progression. starting low and mostly from the tip and progressing inward on leaves is typically Nitrogen deficiency, but it'snot uniformly progressing liek that. are you allowing top 1" to dry before irrigating? if you are watering consistently sooner that that, it could be a root-zone thing. if you have good watering habits, i'd bump N slightly and see how it goes. 7 of 10 instructions from marijuna brands are trash ... no idea what hte actual number is but they usually suggest some bat-shit crazy things - often too much so that you buy more. see problems and think you need to buy something else, lol. my suggestion to anyone that commonly runs into problems while growing... try a different brand. feeding a plant should be one of the easiest things you do. it should not require a constant shifting and adding and taking away... that's a sign of a poorly balanced diet. the urban myths sorrounding marijuana are often wrong. find some Ag brands that aren't dedicated to ripping off hobbyists.. i have no idea bout biotab / biobiz.. they could be good. i see an awful lot of burnt canopies with that stuff in the questions though. and other growers seem to do better. uncertain... when i switched to jacks... the problems i encounter are rare and small / slowly progressing with a clear and easy fix. no more ph-adjusting. no more concerns about pH drift, because it is properly buffered, which is not new knowledge... marijuana brands just tend to be startup companies with no real experience in biology, chemistry, or horticulture. The last one of those has a ton of horseshit mixed into it too, but a longer history than "bro science" .. too many people think like the advertising. my TSP says "improves roots" ... and it sorta does if applied in right balance with other stuff.. but it's not some fuckingmagic bullet that you spread out and all of a sudden rainbows shoot out of your roots. it's not that simple, but it is that simple with a good brand. anything that is a struggle to grow healthy plants from seed to harvest you should seriously consider dropping that brand like a bad habit.