Help!...Sick Seedling..Yellowing with Brown Spots/Blotches (PICS!!)

Hi Guys,

I noticed the lower first leaves on my little White Widows are starting to yellow with brown spots. This is spreading to the upper leaves as well.

Plz Help...any ideas? I searched but couldn't come up with a similar type of spotting and yellowing that matched my problem.

They were doing so well for a while and now this....growing can be really stressful at times.

Come on....no one has seen this b4? Somebody help me out plz...there has to be someone.

No-one? Really cmon...help a newb out.