First Time Grow Looking for Advice

Hi Everybody I am knew to all this and looking for some advice on how to grow some perfect weed Uk based !!!!!!!!!!!!!!!!!!!!!!!!

Set Up

6' x 6' x 6' Grow Room
1 x 400 watt HPS
Extractor RK 125 Fan
Input RK 100
Temp 76 - 80

Strain

6 x White Widow (Greenhouse Seeds Amsterdam)
Veg Cycle 18 hrs on 6 off
2 weeks away from flowering cycle

Noticed a yellowing off new shoots and a weird yellow haze over some of the leafs and a mysterious green and yellow colour on top leaves already growing

Is it Nute defiency as I have been using very small amounts of nutes as they were growing alot better with distilled water
Or is it over watering ?????????
Have read some excellent posts on here and just looking for some help regarding me kids
Look forward to some serious advice

could be overwatering but they look very young to start flowering in two weeks

Hi there Thanks for the advice
How long would you leave under present cycle ?
I think it is overwatering as I have hardly used any nutes yet

let them dry out between waterings & get a small fan blowing on em too....might be suffering heat stress. Looks like you have a ways to go yet before flowering....a few weeks at least. How old/tall are they??????

I think you may be right as I screwed up my first grow due to heat stress I have small fan is it ok to point at plants direct ????????? Thanks for your advice mate !!!!
They are three weeks I suppose it is to early I was thinking of leaving for another four weeks under 18/6 you think that is right ?

yep at least another four weeks of veg cycle. they like a gentle breeze & it will strenghten the stems....

Best of Luck.

6by6 by how high they look ok to me,agree with the fan blowing at least wait till the 5th set of leaves they will double 2 triple in size in the 12 an 12 photoperiod.

Thanks for all your help I am still learning to grow so experience and advice will eventually get what I desire lol
Once again thanks guys for your input !!!!!!!!!!!!!!!!11

it just depends on how big you want your plants and how much yeild. g/l