Help calcium deficiency

hi there Jtrim, the good news is that this is not a calcium deficiency. Calcium will make rust colored spots, plus it's an immobile nutrient meaning such an issue would affect the newest growth first, not last. What you actually have is a potassium deficiency, you can tell from the colorful splotches of discoloration affecting the plant during flowering. Just increase the PK in your NPK, add bloom nutes. This will make the problem stop spreading and the plant should recover within two weeks. The badly affected leafs will not turn back green, but that's okay. Hope this helps ! 🚀