I'll second that.
For diagnosis that is worth anything, it's best to fill out the troubleshooting form:

http://boards.cannabis.com/plant-pro...anted-one.html

This:

"I just wanted to know when I should be transferring the first 8 sprouts into bigger pots"

I can help with.
I see 2 plants in way too big of a pot.
Not a good idea.

And, that's what's wrong with the sick one.
It does not have enough roots and leaves to pull water from that much dirt.
The water sits and stagnates.

It is drowning, or, more accurately, suffocating.
The roots can not breathe.

Always start with a small pot.
Wait until the height of the seedling is about the same as the depth of the pot for growing tall plants.
(No wanna crimp the tap root.)

If you want short and bushy, adults, transplant when the width of the 'ling's leaves exceed the width of the pot.
And only up pot a little at a time.
(There are reasons that we go to all that trouble transplanting, yah?)

In either case watch the weep holes at the bottom.
When the roots start poking out, it's time.

Everything I've typed and much more is yours for the asking by simply clicking on the first link in my signature.
95% of your questions are well answered there.
When you have question that are not answered in the archives, you will get much better responses.

Aloha, and welcome aboard.

Weezard