slow growth yellow leaves

me and a mate are growing the same strain of bud and using the same soil and same kind of pots, same lights,same feeds and even using the same ec and ph metres! BUT his are growin fast and look really nice and dark green and mine are tiny and light yellow!! we using the same lights which are 400 watt hps and similiar size room, we feed them the same day aswell, and im gettin a pale light yellow plant with shoots comin out with 2 -3 leaves and look deformed!! mine are half the size of his and litterally stopped growin, any ideas wat this could be?? this is the 3rd time we have tried in this room whilst his room has worked amazing all 3 times!! the temp is 80f and humidity is low around 30%!

Over watering

Potassium deficiency if the leaves are curling at the ends and the yellow is progressing up the leaves.

iv let the pots dry out and iv tried most things but nothing is workin in this room!! can it just not work in a certain room, its nicely sized, could it be water??

It definately could be the room. There could be some kind of chemical or electronic "pollution" present. I know it sounds weird, but it can and does happen. You might also consider the source of your water. You didn't say it was the same water so that is the most likely difference. Good luck.

sayin that, i had a pc and used to use it in the room!! could that be the problem!! and iv boiled my tap water and put it in the room to go room temp and see wat that does!! thanks for ur info and time!!

could b ph levels in ur soil cs ur m8 might nt live far but the water could be differnt????

will kettle boiled water do anything?? i got a ph meter and use that!! can it be the room tho???

his humidity is higherthan mine aswell!! is humidity important

i've vegged in a room with 20-30% humidity and in a room with 50-60% humidity. The higher humidity plants seemed slightly healthier, but nothing over the top

it just aint workin in this room,,, its buggin me out cus its been 14 months constant tryin and gettin fresh cuttings and no difference, im gonna try a change of room, take it to my mates house!!