My lights are on 18 hours its from 6am till 12am the next day. I was wondering what time it would be good to turn it on during the light cycle. I keep reading about the rockwool tends to stay wet for a long time and tends to build up salt I plan on putting my 1in cubes into the 3inch rockwool blocks while inside grow rocks when the roots become established and then into the eurogrower. Should I let it drip on top of the blocks or around the area towards the roots and so the grow rocks get wet too?