Baby plant needs help

So i am about 15 days from seed and one of the plants i moved from soil pots with the composit cubes into aeroponic system. The 3 other plants i did that to are doing really good. BUT this one looks like its welting and has several yellowish brown spots. I am using superthrive and hygrozyme and my water ph is around 5.5-6 first pic (alaskan ice) is the troubled plant and sadly enough within 2 days of age is the second pic the strain in pic 2 is medical and supposed to veg twice as fast. I HAVE NO CLUE WHY MY PLANT IS DOING SO BAD. ANYBODY, ANYTHING, NEED SOME ADVISE
 

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