thanks for quick reply everyone!
plants are ww and hawaiian haze there is 18 of them i am using organic soil mix and canna bio vega at the moment i mix 15-20 ml of canna per 10 liters of water and i water them once every 2 days.i will start flowering in a few days and will be using canna bio flores and canna boost later on. ph level is around 7.5/8 and i dont have anything to lower it. 2 days ago i ordered some epsom salt, ph up/down solution, carbon filter and fan but didnt arrive yet. i have another 400 watt hps bulb and as soon as i get a reflector i will start using it along with the 600 for flowering. some of the plants are in smaller containers i will move them to bigger ones tomorrow.the room is very messy and it doesnt have proper reflective material on the walls. i whill update pictures soon!