I can't open up your picture to view it any larger than the thumbnail size so its tough to say. Could be container size and they're ready for a transplant but tough to tell from the small pic. Droopiness is often caused by overwatering, its important to let the soil dry out a bit between waterings and don't let the pots sit in water. Also you shouldn't be using any nutes yet so if you are, I would stop. It shouldn't be from not having enough light though, they'll survive just fine with minimal light, they just won't grow real fast and won't grow the way you'd want them to.