Serious plant problems in flowering stage

[Newbgrower78]

Dear growers community,

I'm a first time indoor grower and am having some serious issues that i can't fix, so any help would be much appreciated.
It was growing fine, even after the flowering had started it was doing fine but a few days ago the leaves started curling up and inward, and drying out.

I'm using a Viparspectra 300w, humidity is at 47%, temp is around 30°C, i have a inline fan to supply outside air and a fan inside for circulation, Ph is at 7 and have given it 2 waterings with Plagron bloom.

I've already had to toss out 1 plant, please help!

Thank a bunch!

 

[Rwise]

Drop the PH to 6.5, the edges of the leaves have some light/heat stress, the leave tips seem to say to much nitrogen.
What else are you feeding, the schedule and strength?
Did this start with the new nute?

 

[Rwise]

I have read N can be reduced with black strap 3 tablespoons to a gallon of water.

 

[Newbgrower78]

Hi Rwise,
Thanks for your reply!!!
Not feeding it anything else, the water is rain water mostly some bottled water is added , no real schedule, i just feel the soil if it's dry (2 inches deep) the I water it. Strength is as recommended 4ml/1L of water.
To your second question, it started about a week after the second feeding.