HELP..6th week into flower and fan leaves are turning crispy

HONEYCOMBHILLZ

Active Member
Not sure if its nute burn or nute deficiency or maybe a fungus but these plants have just been getting worse and at this point im not sure what to do next,i sure as hell dont want to lose any plants.
Little info on my grow
4 white widow autos
Smart Pots
FFOF soil
Elite Garden Nutrients
2x 600w LEDS
Water ever two days...pots feel light
Feed nutes every third watering or so

This is my first actual real inside grow and i popped my sprouts right into the FFOF soil not knowing it was to hot for seedlings and wasnt aware i needed to be adding cal/mag during first 4 weeks of veg because i thought the soil was enough for the first 4 to week..should i have cut my soil with something else?
 

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