Help!! Whats wrong with my plants?

Can someone help me this? My plants are 3 weeks in to flowering and the leafs started 2 burn. I have attached photos.

Is this a calcium or magnesium deficincy?
 

allen bud

Active Member
I had same looking thing ,for me it was a K def. i had to boost the potassium and the new growth was better,but that was my case...And she look K def to me IMO
 
I put fresh water in and left them for a few days. there has been steady recovery but I cant get the ph 2 come down under 6.5 no matter how much ph down solution I add. Also th ec reading is 2.2 without nuits how is this even possible? Can anyone help me with this?
 
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