hey man just read through and heres my 2¢ take it how you want.
first off if you plan on keeping these plants going YOU need to fill them cups the rest of the way with dirt, top the right off.
give a 1/8th dose of nutes if they medium you have is completely without nutrients, they need something to eat.
your cab looks great and you have the idea down pat, just need to get rid of the stretching and maybe find some decent compost to mix in your mix for a little bit of nutrients during first 2 weeks.
i really hate to say this and i mean no disrespect but at this point if them seeds are just bagseeds it may be in your best intrest to just start over, having issues like this so early is just going to cost you a good deal of time vegging longer to get them to where you need them. ill post a pic to show you what i mean.
ok all these plants are the same age, the one in the bottom left corner had some issues when it was really small and is falling behind the rest in a majotr way, these pics were taken at about 4 weeks.
by restarting now yuou may have lost a week but if you get it right this next go around they will outgrow the ones you have now in a matter of weeks, like i said i hate telling people they should start over but this early in the game i feel its your best bet, i mean no disrespect and im not trying to be rude just trying to be honest and help out.
next go around get some nutrients in that soil, go get a low low NPK rated fertilizer and mix 1/8 strength in the soil before you even plant 3-1-1 or something along them lines should do you well for seedlings.
dont hate on bagseed, i grew 4 bagseed beans this past summer and all 4 turned out to be female and the smoke was pretty decent, much better than the smoke i got them out of. its all in the dry cure process and you will be shocked how good regular bagseed beans can be
best of luck on your grow, ill sub up to this and follow along, any questions just ask. also you have plenty of lights for now
matt
+rep for starting down the path of marijuanna cultivation