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Indi'-- Why do you have both LED and CFL going? Seedling want less intense light, and of course, veg' spectrum biased (blues),... they don't look cooked, but overly powerful lighting can retard growth,... also, It might be that they just plain don't like the soil,... soil should be a nice even moisture all around while the taproot develops initially... had to tell with that layer of perlite on top! If you've not see many adult fliers of gnats, then a root zone infestation of the munching larvae isn't likely,....