ok guys, so its day four of the 24/0 light cycle and my girls still seem to be doing ok. Sorry about the pic quality but I have to use the webcam on my laptop for the time being.

The one im holding up seems to be doing the best. It has the biggest leaves and thickest stem. One plant has shrivled up leaves with some brown spots on it.
Any advice as to what might be the problem?

The perlite in the cups is starting to turn goldish brown color, is that normal? I believe its just from the water.

Thanks again. You guys are a great help!