my first grow,first pics.

Let me tell you i am new to this website and have been slated previously for the stupid questions in which i asked.I now finally have pics like all you people have been telling me but the quality is'nt great as the kids think it's indestructable lol,before i post the pics i'll tell you about my grow;

It is my first grow
I have 2 white widows,1 kush and 7 i am unsure off,i got them given,all 5 week old,all started from seed,
I am using soil not the cheapest not the dearest,
600watt sunmaster dual spectrum bulb equipped with 600watt ballast and reflector,
The nutes i am using are canna coco a&b,i add the nutes every 3 waters,i water once a day generally around 200ml more if needed when soil dry (4ml of a and 4ml of b to every litre of water that is what i was recommended)
The temps are mid 80s when the light is on and low 70s when the light is off,
I have a tower fan placed under the light and reflector to blow away the heat,
This is my first grow and still on a budget so this is just a standard setup.next time will be better hopefully

Here are the pics;



As you can see the leaves are curling upwards,i have checked this out on the forums and from the info i have gathered it could be a result of heat stress,mg defiecency,underwatering.
I have raised my light,up't my water,not sure what to give them when they are lacking mg. But the light or water hav'nt made a difference
I was thinking of switching the lights to 12/12. dropping them down an hour each day from 18/6 to get some bud
When first growing my plants i know i stretched out the plants but i hope they will be o.k,these are the things i need to know from you expert growers;
Will the plants be o.k even tho i stretched them?
Will the plants be o.k if i switch them to 12/12?
Do the plants look normal and healthy?
When the plant is in flowering will the leaves and stems grow while the plant is budding?
Do you know how to resolve my leafs curling?

I hope this thread has more detial about my grow than my previous threads,i hope you can answer my question and hope these are more responsible questions about my grow,hope theres enough info on my grow and thanks in advance for the advice.
Just want these baby's to hurry up n grow so i can smoke my own cannabis for the first time.

how long have they been in those pots? i would just flip to 12/12. the plants will be fine. if you think they will hit the roof you can always low stress train them with weights, supercrop, and/or bend. they look ok. def some nutrient/ph issues like you mentions. get some air on them maybe an osc fan when theligts are on. plants generally keep growing all the way around into a few weeks of flower some even 4-6 weeks into. I would not trip though your setup will produce and you will learn more and more as you go. rock it and welcome to the freedom of growing. good luck!

They have been in the pots around 2-3 weeks,transplanted them once for the benefit of the plant,i know the pots are too small,nxt grow will be alot bigger,looking on the forum i have discovered, THE BIGGER THE POT,THE BIGGER THE POT lol,all these things i am learning and will progress me to be an exellent grower in the future hopefully,any ideas tho as to why my leafs are curling,i've got 3 reasons tried to alter two of them but no difference,will the plants be o.k to switch to flower in nxt week they are 5 week old nw from seed,again advice appreciated in advance.

Do you think the roots will become root-bound in these pots if so i may invest in bigger pots,if they will be o.k i will use the bigger pots nxt time.