New Grower. Leaves are changing colors. I need HELP.

I have two bag seeds in a bubbler. I have 2 6500k cfls and 2 2700k cfls in reflectors. Theyre 2 1/2 weeks old nd I'm using only distilled water. No nutes. What is going on with these leaves?? They were looking good. Help me please.
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Distilled water needs calmag+ or your screwed. 1/4 nutes they have nothing atm.
 
Depe ds on your water. Check your cities water stats online if they have one.
 
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