Confirm Calcium deficiency ?

if you are using RO water be sure to add calmag to ec 0.3 and then add GMB

I agree with HarbingerOfHarvests, I think the damage is caused by an excess and is not a deficiency. Some of the damage could be mechanical too, as in the lowest leaves rubbing against the pot when the fan is blowing on the plant. My other concern is that you seem to be feeding both "grow" and "bloom" nutrients together. Bloom nutrients are for exactly that, for when your plant is blooming/flowering. Feeding both grow and bloom nutrients together is not ideal. Bloom should only be started/switched over to once your plant(s) have started their flowering and the flowers have developed small "tufts" of identifiable small compound flower growth - i.e. little buds. At the very beginning of flowering, plants still need a fair bit of nitrogen and this is why bloom nutrients are only really needed once the little "tufts/buds have started and not as soon as you either change the light cycle or just the very first calyxes appear. Most tap water contains healthy amounts of dissolved calcium and any decent hydro nutrients should too. There seems to be a preoccupation in the States with cal/mag and I am not really sure why. Both these minor nutrients are only needed in small amount, mainly during flowering. A tablespoon of bone meal/oyster shell flour, top dressed around your plants will provide enough "slow release" calcium for virtually the entire crop cycle. I realise this can not be done with hydro, but it may give you an idea of how much is actually enough. I imagine putting a few clean oyster shells in your reservoir would probably have the same result and save you some money too. Hope this helps...... Organoman.

If your listed ratios on your diary are correct.. You've given her too much or b your far too acidic leaning on your reservoir.. I won't go into why I think Advanced nutrients is a terrible product for hydroponics but it is.. And there schedules and dosing information is horrendous... Check your Tds and PH.. Check your local water supply.. Perhaps you have a lot of calcium in your local water.. Calcium is a common mineral found in local water supplies.. Good water is a big part of growing hydroponics..