Thanks for the lower light pics. It's looking more like a magnesium deficiency with the yellowing and the spots. Epsom salts can help with that if you have any around. 5g/gallon will give you 34ppm, which should be fine if there isn't much in your dry nutes.
If you would rather go with a cal-mag product that would be okay too, though they tend to be heavier in the Ca than the Mg.
If you would rather go with a cal-mag product that would be okay too, though they tend to be heavier in the Ca than the Mg.