Stems are red and spots on leaves what to do

You have thrips check under you leaves with mangnification u can barely see the adults with good vision.

Some would spray sinosad I believe but personally I would not treat for bugs during flower

Could be the silly purple photography playing tricks tooo
 
You sure you don't have an bug issue? Those spots look more like mite damage than an nutrient issue.
^ (see what happens when you post pictures people can see?) you've probably got several things going on, I agree with Jarvid, you need to check for bugs
 
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