Question on my first AG grow seedlings!

Hey all, this is my first grow in a AG and I've got a few concerns about my seedlings, they are gradient yellow to green as the pic shows - Ive got an airstone in the res and my Ph is reading 7.2 (tad high I know) I think its the Ph from what Ive read but Im not entirely sure, what do you guys think?

Lightup.

P.s. sorry for bad pic quality Iphone cam is terrible!
 

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