Help! Leaves curling under. Advice?

hey guys, im doing a first time grow in my closet and just grabbed a 150 watt hps grow lamp for the 2 plants i have. I'm really inexperienced to be honest and was wondering if anyone may know why my plants leaves are curling. should i flush water through them to be sure there's no salt build up? or check ph levels and see if i need nutrients besides what came in the soil. any help would be great.

For soil, I'm using Miracle Grow Organic Choice Potting Mix. Not sure if you're familiar with it or not, but it's 2 month continuous feed w/ about .10% nitrogen. I actually just switched over from a 6 month feed w/ twice the amount of nitrogen- everywhere I've gone to grab soil has been sold out of what I originally got, so I was forced to switch. This was the closest I could get.

My thermostat is set for about 65F, but because the bedrooms in my house are on the second floor, the heat rises significantly and it gets no cooler than about 75F with the lights off. Lights are on right now and it's 80F.

I'm not currently using any nutrients. I've read that nutrients aren't always beneficial to the plant, so I honestly wasn't too sure about that.

I wasn't too sure what to do, since I'm a beginner. I just put them into flowering (12/12) not even a week ago- maybe tops 5 days w/ the HPS lamp. They are both between 21-25 inches tall. But in all honesty, they are 2+ months.


Thanks in advance.

Next time add 30% perlite to the soil. I don't like MG soil but the organic line is OK.

So do I just add it on top of the soil I already have? Or are you saying the next time I do this, initially start w/ the perlite? If it is ok to add it, will the water distribute the nutrients- or should I re-pot?

Start with the perlite...no way to get it in now in a way that it could help...make sure you are letting the pots get dry between waterings, and try to get more light.

Alright, thanks. Appreciate the advice.