Have they busted them tiny netpots yet? They will! You should put them in 6" or 8" net pots very soon. cut out part of the bottom of the larger net pot and lower the roots thru. then cut 4 sides of the small pot from top to bottom so the the roots can push it open easily. Otherwise, your going to have a mess when those BIG girls split those pots!
I've debated growing some in DWC or in my soilponics rig. So I'm excited to see your DWC grow!