Pics of some Curled up leaves any help on the matter appreciated. First time growing

So the situation is that i noticed some curled up leaves no brown spots, no yellowing and no bugs either. They have to much water i used a moisture meter on them they all read at 10 (which was the highest reading ). as far as soil ph i tested that and that was in the 6.0 to 6.3 range. The humidity was and is at 30% at all times. the heat source is 1 400w lamp about 22-24 inhces away from the plant tops. im growing in 5 gallon air bag containers with two fans on them constantley running to maintain airflow. im also running a 24:0 light cylce. Im growing autoflowers for my first grow. SUPER CHRONIC? Sounded very tasty haha. i will post pics so i can get an more in depth answer i do appreciate the help guys. Just new at this hoping someone can help me out. !! thanks a bunch happy growing. Also seemed to notice that on 2 of the plants here in the pics have like a darkish line on the stem itself of the fan leaves dont see it on the slightly bigger one in the same room.??? Thanks guys help i am able to get some help!!

To me that looks as if you are feeding it to much nitrogen or you heat is up too high. What are your temps? What is your feeding schedule. Also you shouldnt put an auto in 24/0 you should atleast have her in 18/6 that way she gets rest and is able to put all that energy from the day to use. She will grow quicker. Raise your humidity that could be part of it too 30% is on the low end.

My temps are between 75 and 81 degrees lights on ...and lights off close to 65 degrees. which scares me to turn them off for that long. And a nitrogen problem is that a hard thing to correct ? i saw online with autos its possible to grow autos at 20 and 4 ? i mean what you think about that ? and thanks for the post! ...And anyone else can post in to any info wanted thanks guys!

So i have gnats im going to add about a inch of sand to the top of my soil tomo and see what happens. also going to get some yellow stick strips. any input welcomed everyone could us any help

Don't add sand, the first reply is right on about over feeding (IMO) , I would flush with water then give 75% the nutes for a while and see if that helps with the new growth. Add perlite or gravel to the top, sand will act like a more air proof lid and will greatly slow the water uptake ability of the plant in a negative way, I assume.

the product you want is called a masquito dunk, crush one up add to a gal of water and they and their eggs will all die, but the best thing IMO is lots of neem, it will kill them over time but its main use is to cure plant nutrient issues before they start. Neem makes more nutrients more mobile so the plant can move its food to where it needs it most. Quit using neem a week or 2 into flower or as soon as you see flowers

that is called taco-ing, and is most associated with high temps and low rh.

It's not a nutrient issue. Low humidity high temps. Probably low humidity.

Okay so i didnt do the sand thing i ended up going with perlite about 1/2 inch thick on top of the soil and put up yellow sticky paper to catch the gnats. hopefully it works well ! fingers crossed . And as far as humidity probs whats the best thing to do ?? any input guys ? dont wanna start a billion threads asking a shitload of newb questions would rather hear it right here! thanks a bunch hope to hear from everyone.