Seedling pics problem PLZ advise!

HI I have these seedlings for 10 days growing in seedling soil from promix . All the sudden the chlorophil is going yellow from tip of the leaves. It looks like its being washed away. I have pics attached. Any ideas. I just added water. Temps are 27- 30 c. Light is 400 mh at 2 feet distance.

No response? ((((((((

Please gime some suggestions. My girls are Sick. ((

Add gardenlime to the mix:http://www.google.com/products?hl=en&rls=com.microsoft:*&ei=-p8xSsy4JJ36tgOzpNDQBg&resnum=0&q=espoma+garden+lime&um=1&ie=UTF-8&ei=_J8xSr3CAaXgsgO96azMBg&sa=X&oi=product_result_group&resnum=4&ct=title

imo they look a little overwatered, grab some biogrow.

I thought I add that things worked out. They are doing very well. Thanks for your suggestions.