Seedlings Look Sad

Thread starter #1
At first, sorry for my bad English, I am not native.

Hi guys, i hope it will be my first grown, I bought 2 vision seeds auto white widow and 1 advanced seeds jack herer and I started to germinate them. They are now 10 days old. In first 7 day, there was no problem, they crack their seeds and cotylodons look healthy. But last 3 days, white widows seem unhappy. However Jack Herer is still fine. I do not know what to do, I search and read a lot of things but all problems which I searched related with allready grown plants. Can you please help me to give them their life back. I do not want to lose them.

P.S: I noticed that even they are in same age, Jack Herer is growing faster, is it normal? Or is it just because white widows have disease?

My setup:

* 400w MH/HPS light (I keep the light 26 inches (66 cms) away from the pots)

* Biobizz Light Mix soil

* I will use a local brand bat guano for whole grow (I do not have enough money to buy good brands) (The specifications are:
1) Total Organic Matter: 15%
2) Total Nitrogen: 1.5%
3) Total P2O5: 2%
4) Total soluble K2O: 1%
5) Total Humic and Fulvic Acid: 2%
6) pH 4.5-6.5

* My soil's pH is approximately 7, maybe little bit higher (7.2-7.3) (In order to decrease it, if you have any cheap solution, please share with me, the pH downers are too expensive)

Some photos (healthy plant photos are Jack Herer):