600W HPS, SOIL, First grow!

[Badjaka22]

Hello guys, I want some opinions on my plants.
Let me give some info!

Room size: 4x4x7 grow tent
4" Exhaust TT100 fan, passive intake, and a small fan blowing inside the tent(after 2 days i will upgrade with a bigger fan).
I grow in BioBizz All-Mix Soil, transplanted from Light-Mix.
Light: 600W DualSpectrum HPS(aircooled), 90W CFL 6400k as side support light.
Pots: I use 6 Air-Pots 15L(4gal) each.
Nutes: I used Biobizz Root Juice for the first 2 weeks, now I'm using Biobizz Bio Grow and Bio Heaven. In flowering I'm going also with BioBizz Alg-A-Mic, Bio Bloom and TopMax, i already have them.
I grow six plants at the moment.
Strains: 2x Female Seeds White Widow X Big Bud, FS Lemon Kush, FS Purple Maroc(its an outdoor strain I know..), GHS Big Bang and G13 Labs Blue OG(pretty new strain).

I've done some researching over the internet. The plants are germinated on 25.04.2013, and now its exactly one month of growing.
I've done LST and topping on all of them.
I keep the lights at 55cm(21") from the tops.
I'm running 18/6 and temps are always 29-33C (84-91 degrees).

This is my very first grow, so I have some questions:

Some of the lower leaves are yellow, one felt down as I barely touched it.

1. Look at their symtoms, could that be N def?

I just gave them each 1L of water, and that are most bushy I gave 1.3L of water.
The amount of nutes I used was 0.6ml Biogrow/L and 0.6ml BioHeaven/L

2.Do you think they are ready to switch to 12/12 and get some decent amount of buds?
I'm aiming around 7-10 oz (190-280grams) so me and my Girlfriend can have some pretty good smokes for a long time.

Thanks and RESPECT!

Some pics:

 

[Badjaka22]

some more pics:

 

[Javadog]

I have seen some of this in my current crop.

...I am growing six breeds, all new to me, and wonder if it might
be genetic to a dregree. My PurpleBerry's are really pale, but they
seem happy otherwise.

I really bumped the N, adding some Sea Green and another kelp
based feed, but they stayed pretty much the same.

I expect that this effect will lessen with time.

Mine are at about a month, with two weeks since the flip, after
a two week Veg.

I hope that you find what is needed.

Good luck,

JD

 

[Badjaka22]

i hope for sum answers

 

[C@nn@M@n]

looks like N def to me.

 

[Siomha]

the same problem occured with my first grow. the leaf was looking very much the same like yours.

As I transplanted them into bigger pots and changed the light scedule they were turning into beautiful.

Also I had to add Mgns and N and no problem after it.

Had the same biobizz stuff and dirt like you.

And I didnt add perlite to the soil the first time but was still surprised what came out of it.

 

[Benjamin Check]

Looks like N deficiency. Foliar feed them to get some instant nitro in them and then give them a 3/4 dose of N and see how they respond. If they green back up fully within a few days, leave them, if not, give another 3/4 dose of n.

 

[Fatduck]

Nice grow

peace

 

[stinkymatt420]

More yellow from bottom than the top. I would say more Nitrogen. Also couple of those were in need of a drink pretty bad too.

 

[Jibman]

Any updates?