Hello everyone.. Ive been growing 16 kush plants in veg for about 4 weeks now and they dont seem to be growing as fast as i would have thought.. This is my first grow by the way.. But from wat ive read they shud be at least a foot tall.. About half are between 15-20cm and the other half are 20-25cm... They were under a 600w hps light for two weeks while they were in 1litre pots and have been under two 600w hps lights since i put them in 5 litre pots two weeks ago.. They get fresh air and biobizz grow nutrient.. Wat could have caused them to grow this slowly or am i paranoid?