Northern Lights, deficiency

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Hello guys, i am having trouble with my first grow and i am looking for help. I have two plants, the older one developed a deficiency with brown spots on the leaves and is in horrible shape. Her leaves are drooping and many have dried out and died, being 72 days old and flowering since 15 of March, she has no smell and no trichomes at all.
Honestly i don't expect that she will produce anything, but i do not want to throw her away yet.

The younger one though was perfectly healthy with thick stems, huge dark green leaves etc. She started flowering about two weeks ago and is starting to develop the exact same deficiency as the older one. I don't want to lose her too but i cannot figure out what is the problem. Yesterday i fed it and upped the dose to 8+8 ml of biobizz grow and bloom in 4lt of water, Ph 5.5 and 6.2 in order to get a better range.
The medium is biocanna biottera plus, peat/coco, i am using Ro water.
Any help will be much appreciated:mrgreen:
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Flush with 3 to 4 gal of calcium water along with bloom nutes. Some yellowing of leaves at this point is normal.
 
What about the small one? Is this a calcium deficiency or excess?
For the big one is it normal to have no trichomes yet?
thx
 
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