Calcium def.

CaMg. my hydro shop sells mini bottles for 8$, decanted from a big ass tub of it. perfect for this.

Cook up your batch of homemade Cal-Mag supplements, using Epsom Salts (magnesium sulfate) and Calcium nitrate (a common fertilizer). The ideal ratio is two parts calcium to one part of magnesium. A safe homemade Cal-Mag concentration would be 380ppm, with 260ppm Calcium and 120ppm Magnesium. For reference, you would need around 6g of calcium nitrate and 4.5g of Epsom salts per gallon of water. Make foliar spray apply to leaf, calcium will be absorbed through leaf and should show immediate improvement if calcium is the culprit.

So long as your medium ph is good, ec is good. You just need to give time for dolomite to work making sure it doesn't drift too far alkaline. Fastest acting soil acidifier is aluminum sulfate, effects are almost instantaneous due to aluminums reaction. If your hellbent on organic ammendment, I like to use it to keep ph tickety boo, easy to mix with water and apply.

yeah i would just buy a synthetic calmag fertilizer, because as said, it can take quite a while and your plant needs it kinda now. If you buy one that can also be used as foliar spray you could help your plant quite quickly. i use the canna calmag, but it's really strong, and foliar spray always means 10x dillution. good luck with your problem!

Don't fuxk with slow release, doli lime that can take 2–3 months to fully break down in soil before its available. The rate at which it releases depends on the amount of lime applied, the soil type, and the desired outcome. The rate at which dolomite lime changes the pH of soil depends on the amount of dolomite added, the soil's buffer capacity, and the grade of the dolomite.