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looks like a pH problem to me but the pictures are very blurry. I can only see yellow on the first set of leaves.
when you say the stem is purple, is it the part below the cotyledons? because that should be purple until the plant grows and matures.
you really need to invest in a temp/humidity meter as well as have a fan blowing over the plants at all times to make sure they are getting enough co2.
I suggest you flush the plant with distilled water (water it with about a pint of water), and STOP feeding it until the yellowing disappears or until you figure out the problem.
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