Need HELP!!! PICS!!!

Right now the bigger plants or just bagseed. I dont know too much about them but they are about 3 or 4 different strains of plants. They have been doing pretty well up until now. The smaller ones in the jiffy pots are Sative Spirit and some type of Skunk. Well the problem is with the reggie bagseed. About three of them are curling starting at the top. I really dont know what the problem is. I just raised the light an hour ago (maybe heat a problem).

I use Organic Miracle Grow soil
400w MH light
Temperature: 70
humidity: about 65-80
Light 16 on 8 off

Just built grow room
Got a skunk mix & trainwreck on the way from Attitude

looks almost like under watering cuz they look crunchy.
but it could be an over nutrient if your feeding them.

give us some info on your fertilizer.
and whats the deal with 16/8?
18/6 or 12/12 nothing in between.

You can do anything light schedule you want as long as it works for you.
But it could be underwatering or overwatering. What do the leaves feel like?

I use no nutes. Sorry the light schedule is 18/6. and the leaves feel rubbery. could it b i need nutes?

never go with nutes as ur first measure of correcting something first i would say ur over watering second would say check ur ph for the size they r there should be more than enough in the soil for them. the best way to water is just by picking them up if they feel light water if not dont