1highman,
i can see now the pic's at post #27.
it look like MAG deficiency, not CALCIUM.
cal def will show on upper leaves, as it is not moble element.
mage def will show on older leaves first. as it is moble element, the plant drews it's resrves to support new grow.
so the solution should be EPSOM SALT, not cal-mag.
but for myself, i use GHE flora 3 part, soft water formula on RO water, but still i add cal-mag, 50 ppm of it.
the main source of mag in GHE 3 part, is the bloom bottle. NPK of 0-5-4 and 3% magnesium, 5% sulfur.
the grow bottle only has 0.8% mag in it.
