Papa Indica
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The water in your garden comes from outside. Just sayin'.
cal-mag "abuse" is a common issue - it's helpful in the vegative stage and 1st week of per-flower only - and then should be used sparingly@slimjimham you'd know if it was over-aeration because you would have white buildup at the water line of your rezzies- that's the calcium falling out from too much O2. I stopped using air stones and put small pumps at the bottom of my rezzies to keep water moving and always coming up to the surface (plenty of O2 exchange that way)
That looks like calcium deficiency but could be due to imbalance in your base - too much PK can antagonize calcium uptake. If the nute company is worth a damn you shouldn't have to ever add cal-mag, if a nutrient doesn't work and you can't make it work without amendments, it's TRASH.
Have to agree with Hawkman. It takes me 2ml of cal-mag plus per gallon to hit my mark of 70 ppms' of cal-mag in my RO water