Need help with a leaf problem.

My problem is leaves on my plants start to turn a rusty orange color then curl up and die. It always starts with 2 fan leaves coming from the main stalk. Any help would be appreciated.
 

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It's tough to determine without knowing what and how often you have been feeding etc.


This is a pic of calcium deficiency... is this how the problem started?

Calcium_Deficiency_in_Marijuana_Plants.PNG
 
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