Deficency? Pics

Hi please need help. Whats up with these babies? They are 42 days from seed just had new soil - biobizz allmix. Just been plain ph'ed 6.8. Had 1/2 strength biobizz growa week ago. Are they really hungry?
Thanks

I was thinking N def. anyone

Or maybe really hungry but, i watered 2days ago and they still quite wet. Do i jus water again? Please any ya?

Do not water until they need it. ph?
http://www.drugs-forum.com/growfaq/97.htm

Ok. water ph has been 6.6-.6.8 with and without nutes. are they real hungry tho? thanks

Im still a newb, still on my first grow, but ive heard to let them go from dry to wet. if they are wet and/or moist, do not water till they are dry. It works for me anyways. For the ph, if it is what you say it is, and they are still yellowing, browning or curling, it could be some other deficiency