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 Iron or neither? And what can I do, I'm growing organic and I don't want to burn them.

Attachment 283097Attachment 283098

pH meter is now hopping between 6.4 - 6.7, if that means anything. BTW, this is the meter I am using. I do not suggest buying one...
Ferry-Morse Digital pH Meter

Attachment 283124

Sir,
feed with rooting hormone mix, something like 10% veg food mixed to 90% water or a diluted clonex or olivias solution for feeding,
Organic veg room 4 cycles in veg, Legal Colorado MMJ Medicinal grow room. 5k in t5's - YouTube