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Green genes, check out the Defciency Pic Depot I made here, it's a Sticky thread listed at the top here in the Infirmary,...
... and you may still be right, early symptom manifestations can be misleading, overlapping with other defc.'s,... but K defc. almost always has necrosis on the "teeth" tips,...
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Bully- definitely time for nutes! That soil is anything but complete for nutrition, especially micronutrients,... CannaBoost is a flower booster supplement, not a primary grow/bloom fertilizer, you need grow ASAP....
... you need a pH meter (for liquids only), plus the calibration solution (preferably both 7.0 and 4.0), and the storage solution... a soil pH probe, for direct in-pot measurements will highly recommended (Accurate 8 by Control Wizard),... an inexpensive TDS meter will be handy, not needed all the time, but provides critical info you need to know (mainly water hardness, ppm's).... All this goes to management/monitoring your water and nute inputs, which go huge miles toward avoiding off pH in the soil, which can be a bitch to fix after the fact! Prevention vs. cure, man... Without these, you are flying blind, and only sheer dumb luck will see you finish w/o issues, trust me,.. :smoking: here's why, graphically put: