Is there any soil in them pots, i see alot of perlite and vermiculite? I think the soil to perlite/vermiculite ratio was somthing nearer 10 percent prerlite/vermiculite. Over here that stuff is exspensive so you can't grow straight in it. The water retention is good for soil but too much and the water can just drain through the soil. Also it weakens the nutes in the soil as it has very little, maybe as asaph suggests just go with a normal soil and potting mix, i agree the seedling looks deficient, badly.