Ack!! they are seedlings still. To soon for DWC setup. keep them under the floro light until you got a good 2 or 3 sets of leaves and keep the light close. put a small fan to create a LIGHT breeze to help strengthen stems. Plain Ph'd water for now. if it was me I would leave light on 24/0 for now also. 1 drop Superthrive per gallon of water that they get watered with wont hurt a bit if you have any.
keep us posted and Good Luck!! :thumbsup: