Half a seedling dying

Okay so I've finally managed to grow past the cotyledon stage. The problem was the 250mh was too strong, as switching to CFLs for the start have worked.

Two of my plants which are Seedsman White Widow are doing great. But the Royal Queen Northern Lights not so much. Half of the plants leaves are dying (one cotyledon leaf doing good, the other is bad, and the same goes for the first set of leaves.)

Any ideas?
 

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