So I have several plants that I'm growing in pots outdoors. All of them look pretty healthy except for my blue dream which has started spotting on many of the leaves and is rapidly getting worse. I am using edna's best potting soil . I also ordered a pH kit which arrived yesterday, it shows that the pH of my tap water is around 7. I've been adjusting to ~6.5 or so when watering.

Anyway, here are some photos of what I'm currently dealing with. The first of which was taken two days pior to the other three.



Based on the charts provided on this website and some other research I've done I suspect a calcium deficiency but I don't know if that's correct or if there are other culprits at play. Any help would be much appreciated, thank you!