Seedlings need diagnosis

[Sunmaid]

• Strain: Haze x Skunk1.
• Soil: mix of 1 part vermiculite, 1 part FFOF, 2 parts FF Happy Frog.
• PH: I don't trust my shitty meter, which says 7.0. junk
• Nutes: No
• Lighting: 4' 4bulb T5 6500K 18/6
• Temps: 74F on / 72F off

Aside form the coloring, they are also growing very slowly. They are about 3 weeks old here. I'm also growing 3x Blackberry from Sativa Seeds which are displaying no problems. I've never seen seedlings do this, and I'm terrible at figuring nute problems.
Is this N or Iron or neither? And what can I do, I'm growing organic and I don't want to burn them.

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Sunmaid Reviewed by Sunmaid on 03-02-2012. Seedlings need diagnosis Strain: Haze x Skunk1. Soil: mix of 1 part vermiculite, 1 part FFOF, 2 parts FF Happy Frog. PH: I don't trust my shitty meter, which says 7.0. junk Nutes: No Lighting: 4' 4bulb T5 6500K 18/6 Temps: 74F on / 72F off Aside form the coloring, they are also growing very slowly. They are about 3 weeks old here. I'm also growing 3x Blackberry from Sativa Seeds which are displaying no problems. I've never seen seedlings do this, and I'm terrible at figuring nute problems. Is this N or Rating: 5