leaf color

After flushing a couple of times, mysterious nutrient deficiency continues.

it\'s about three days that I\'ve changed the light to 12/12 and now half of one of the leave\'s color is changing to pale green. also, top leaves are all pale green...can anyone tell me what it is and what should I do?!

hello dear freindz :) first grow from unknown strains-day 14 Strain —unknown #of Plants — 4 Grow Type - Soil Grow Stage - Vegetative Bucket Size — 1 galo(transplant in day 5 :\ Lights- 600 wats Nutrients- bio-bizz PH - 6.5 RH - 40% to 55% Room Temperature -24-27 c Room size-...

Day 30 from seed Found these leaf discolouration. this is 2fast 2vast in soil. Need help ASAP.

Hey, First timer need some help :) I'm in my second week flowering. The problem started with yellowing leaves in the middle of the plant. As I have vegged for 3 months plus i figured some was normal but now much more turning yellow as well as the tops are turning bright green. I added more...