Urgent please! discolored leaves are now dying, 3rd week flower

[xuanlang]

I cannot figure out why this is happening, please I need some help!

What Strain is it? unknow seeds
Is it in Vegetative or Flowering Stage? flowering
If in Flowering Stage... How Long? 3 weeks
Indoor or Outdoor? indoor
Soil or Hydro? soil
If Soil... What is in your Mix? universal potting mix , coco, perlite
If Soil... What Size Pot? 2,5liters and 4 liters
Size (Wattage) of Light? How Many? cfl 23W x 2, LED 120W panel
Is it Air Cooled? yes
Temperature of Room/Cabinet? 23 degrees celsius
RH of Room/Cabinet? quite high, 60 to 70, even with a dehumidifier
PH of Medium or Reservoir? around 6,5
Any Pests? no
How Often are you Watering? 4-5 days
Type and Strength of Fertilizers used? miracle grow for tomatoes and veggies, once every other watering( so every 10-12 days) strenght is the same as suggested on the bottle
Size or Square Footage of Room? 1,2 m x 1 m

Leaves tooks from discoloring to dying in just 5 days, I suppose over fert or light burn, as the LED light were quite close to the plants and the tallest plants got the worst synthomps, or maybe nute burn but I did't really gave them much fert.

Hope for the help of some kind grower! thanks in advance!

 

[Gadfly]

For them to crisp up like that in five days nute burn is very likely. If you're using that shake 'n feed I would stop. That stuff can fry up cannabis w a quickness. Flush those girls asap w/ distilled PH adjusted water.

 

[oldman60]

Like Gadfly said stop the fertilizer and flush flush flush.