thanks again zandor for the help, can i ask what exactly is ro water? ive seeded one of my seeds in the rockwool and as the white root has popped out ive put it under my light at about 30 inches away. is this anygood?. also shud i water the rockwool cube? wont it dry out. im buying a pen this weekend, and then next weekend ill buy the other measurer u mentioned. in the next few weeks i shud have all the equipment i need and then i can just upgrade to better parts. thanks again zandor.

btw, the cube is just sat under the light, it isnt sitting in water, im meant to just wait till i see the roots right and then transplant?