Help! Lower Leaves turning purple?!

The lower/older lower leaves on my seedlings are turning dark purple an then dying (turning white). What is wrong with theM?

what be the problem?

Are they getting cold?

nah its always above 70

Phosphorous def then.

they are just like 3 weeks old, still kinda early for that right?

pakalolo808 said:

they are just like 3 weeks old, still kinda early for that right?

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I don't know about phosphorus deficiency; but I do know that lots of plants have purple genetics floating around, which only surface once in a while(mendel's peas). sometimes you'll get one or two that may be purple stem to the dicot and no higher, or partial purple.you see it a lot more of this outdoors. like my avatar sgt.kahneohe...she's a kahuna from soma..now you wanna' see the most beautiful weed, go to soma's website. my kahuna cuttings turned mostly RED! ...and yellow and orange and purple.

got some pics