plants are struggling

ok let me start with my set up.im using my down stairs 6ft in height and 4ft by width room,ive got a small window with a vent leading to outside that i open atleast twice aday.im using a 400 wat hps.im growing orange bud which i started out from seeds.I started with the wet paper towl which worked great to start them off. Now my problem started when i planted them in pea pots in a propagator the side started to show signs of mold after 1 wk, so i took the brave step an repot them into bigger pots.as you can see from my pics sumthing is not right.As for humidity and ph of water i dnt no cause my water here is fine and was i told to leave it standing in a bowl for atleast 24-48 hrs and my humidity is ok cause of such a small space an a outside window...any help will do !

you must p.h. your water dude and you need to know the temp+hum is ,r u feeding them any nutes?

ive read a few times not to not feed them nntes until there atleast 3wks old ?

look like heat stress, at any rate get the ballast out of the room

I don't see any perlite in your soil. Isn't it suppose to be 50/50?