Can anyone help please

hi i got everything started yesterday for the first time at 7am the light came on got it set for 20 hours on 4 off ihave the 300 watt cfl 5 inches away from my seedlings and the lid is off the seeds are in a 1inch rockwool cube in 12/20 x-steram areo ponic propagator even though now its a bit less cos the seedling have shot up nearly 1inch and the roots roots are popping out of the bottom the 1 inch rock wool cube already im just wondering if i should leave the spray on 24/7 in the propagator temp is 78 -83 and humidtiy 32% with fans all on wat do ya think i also put 18ml of rizatonic to 6 litres of water in the propagater and ph'd it to 6 i had the spray on for 1 hour yesterday morning and the rockwool cubes were soaked so i turned the spray off is that good or bad i just put it on for 15 mins this morning and hand fed them a bit tonight whats the crack with 1/4 strenghth and half strength is that just 1/4 strenghth of the recomended dosage on the bottles of nutes.also when lights out comes on at 3-7am in the morning should i turn my intake fan of so it doesnt get cold cos my intake fan is bringing air in straight from outside and i live in the north east of england not the wormest place in the world please can anyone help.

leave the sprayer on 24/7

as long as rockwool is wet youll be fine. lower your ph to 5.5 roughly. if you got roots feed them. easy though. for clones 65 degrees ambient temp and keep it moist.