Guess The Deficiency Game!!!!

blight looks simalar, are you sure it is a nute deff and not mold? this is the time of year it starts in on plants hard. you mighht want to look into that. just a suggestion

Hi I have some deficiencies here.
Do you great people know what may be my problem.
Using 400w hps in promix bx with some perilite and vermeculite. I started using GH for the 1st time. I dont have PH tester but will get one tomorrow. Most have some leaf curl starting and some are starting to droop a little. These are 3 weeks in veg. Running lamp 24/7.
How much GH am i supposed to use with soil, 1/2 the amount or the same as directed???