Help! First time grower (with pictures)

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My leaves are very dry and crispy to the touch and are curling down. The tips of the new growth is yellow. It isn't affecting all leaves so I'm thinking maybe nitrogen toxicity? Here's what I'm working with:

Day 20 White widow autoflower
2x mars 600w LEDs
4 gallon pot
400 cfm fan with two passive intakes.

The lights are 20/4.
Temps 79 during the day and 69 at night.
Humidity is around 55%. I have a humidifier running in the tent.

I've been using distilled water with calmag. I used nectar for the gods nutes for the first time a few days ago at 1/4 strength.
 
Would it be okay to drill extra holes on the bottom of the pot at this stage of its life or do I risk damaging roots? I suspect it might be holding too much water towards the bottom because my moisture tester says the bottom is still moist while the top is bone dry. The pot is 12 inches deep and the plant is around 11 inches tall.

(I drilled some extra holes in the pot before I started but maybe it wasn't enough?)
 
Would it be okay to drill extra holes on the bottom of the pot at this stage of its life or do I risk damaging roots? I suspect it might be holding too much water towards the bottom because my moisture tester says the bottom is still moist while the top is bone dry. The pot is 12 inches deep and the plant is around 11 inches tall.

(I drilled some extra holes in the pot before I started but maybe it wasn't enough?)
I would advise against drilling some holes at this stage in the grow. I honestly do not think there is a need to flush. Your plant is showing some signs of over fert, but it is not fatal at all. The time to flush is when the leaf tips have been burnt, from what i can see your plants are just fine. Just be careful with how much you feed and let the pots dry out for 3-4 days before feeding again. A good way of knowing when to water your plant is lifting the pit up and getting a fell for the weight of it after watering. Then check every 2-3 days and when the pot is really light its a sure sign to water again.
 
:toke: Rit'-- the pics are viewing wonky, mate, I can't see much of them,... I see the clawing, but not the dry necrosis you're talking about,.. are they at the bottom? What's the NPK on the Nectar?
 
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