At this stage i had them in the dome under 24/hr light from a 2ft t5 fluorescent grow light for the first week of its life.
I water them everyday until they pop with plain tap water through a boogie blue filter, I use a regular water bottle, I poke about 3 or 4 small holes in the cap facing outwards with a hammer & nail. That way the water its a nice gentle watering that wont move the seed around.
As soon as they sprouted started using warm tap water lol PH'ing it down to 6.-6.2 adding .5ml of power si.