Leaves Yellowing, plants starting to die. HELP! PICS!

Just regular top soil from hardware store.
Water is tap but i let sit for a couple days to dechlorinate.
No nutes yet. water every 3 days.

These plants were goin good but now are seeming to die. PH is probably high 7s middle 8s maybe thats it? dont have a test kit. i have 6 23w cfls. not to hot either, and not overwatered, or underwatered. HELP! THANKS!

PLANTS ARE ABOUT A WEEK OLD.

If you think it's a PH problem add lemon juice to your water, It will lower the PH of the water. A few drops should suffice.

lower the ph, and at this stage i put in like a teaspoon of nutes, just to start them off a bit

so do you think it is ph? any other things do you think?

i would go to a fish store and buy a PH tester they are like $10 at the most. use lemon juice to lower your water and baking sode to being your ph up. but when u use these house hold thing u have to let the water sit for and hour or so and then test it again,before u water you plants. the other thing you should pick up is foxfarms grow big.it cost $17.99 at the hardware store. let your dirt dry out and then get a Gal of water and PH test it. lower your PH let it sit for and hour and test again. then add your foxfarms and water your plants. what is happening is that you plant have a nitrogen def, and PH issue.
Ps these things you need to do fast to save your plants. dont give up yet if anything u can learn alot from all of this.
also check out foxfarm web site they are cheap and great to you!

this happen to my plant http://www.ganjagarden.org/viewtopic.php?f=5&t=219