Light spots and burnt tips

I agree with @GreenThumbCanadian... your nutes aren't designed for cannabis at all! My veg nutes have an NPK of 6-4-4 but when they are in pre-flower, I switch to 0-0.5-0.7 as nitrogen (I've found) is pretty harmful at that stage. As she gets into good flower production, I go with a 2-8-4. The other thing I've noticed in your diary is the dramatic difference between day time and night time temperature.... cannabis doesn't like that! Try not to let the night time temp fall more than 5 or 10 degrees (F) from the day temp... Good luck with your grow, you've not done anything major-league wrong - just give them better nutes! 😊

Could be a couple things here *in my opinion*! 1. There is no mention of what PH you're watering her at, could be improper PH which would cause nutrient lockout! 2. Tomato/Garden nutrients aren't generally made for cannabis. You're nutrients have an NPK of 4-6-3 and cannabis should be for vegetative 10-5-7 and for flower 5-10-7 give or take.