Unfortunately I can't say I'm new to growing, I've been at it for a while in fact. Yet I'm running into this issues the last couple harvests, and now I'm reaching out for help. It seems to me it's a calcium or magnesium deficiency, or both. The last watering included: 1 Tblsp Pure Blend grow, and 1 Tspn of cal mag. This mixture ppm's at 650, and they're in soil. I feel like something's wrong with this picture, hence the deficiency I'm looking at here.