First time

i got my waterfarm i got three seeds sprouted already and i have all three of them in rockwool in my waterfarm i dont plan on having them there the whole time i plan on building a dwc for them. they are like 2 weeks old when should i start watering 24/7 or shouldnt i? i also got a 400w mh when should i put the plants under it? i phed the water in the waterfarm to 6.5 and half way on the nutes.
help my first time in hydro

get them into the dwc quick before they outgrow the rockwool and that will fix the watering problem, but while they are in the rockwool you cant water all the time you need a set time of watering and dry period. something like water for 15 min every hour or so, you need a timer and a res with a pump to do that though. at two weeks you can put them under the mh but keep it off of them at least 1.5 feet untill they are in full veg then you can start moving the mh closer.