I dunno whats the technical word for it, its the jiffy pallet(or pellet), the ones that come like a small disk, when u add the grow..Peal pallet or peat pellet? If a peat pellet then the roots can easily grow through the fabric.
thx dude One last question should I take off the plastic thing that's around the large rockwool cubes ?Waiting to transplant is only really relevent in a soil/coco medium, where you are waiting for the roots to use up as much of the space as possible before giving them more room to roam. If this is a hydroponic grow then it's not necessary, and they can be transplanted whenever really.