i would say. check the soil. they look pretty good accept for the yellowing one. that could be from overwatering or nute-burn from the soil you are using. get some organic soil with no feeders and that will help.
if you want to check out a CFL set up and grow box. look at page 3 of my grow.
i think you can click on my signature,
if you have questions on the lights and where to get them send me a private message.
and btw. that fridge thing... be sure you have good ventilation in there. intake fresh and exhaust the stale air. CFL's dont put off too much heat but when you get more than a couple in there it will burn em up!!
good luck with your grow mang!!