You can go from rockwool to
grow rocks. Just make sure your water level rises high enough to wet
the cubes until they grow new roots.
I primarily use vermiculite soaked with Olivia's Cloning Solution with almost a 100 percent success
rate for cuttings. I also use vermiculite for starting
seeds. I sprinkle the seeds in a tray of Oliveras
soaked vermiculite with another thin layer to cover the seeds and when the plants are big enough to
transplant into your system I loosen the vermiculite around the roots with a spoon and rinse to
remove loose vermiculite before carefully putting grow rocks around the plant roots in the solo cups.
Ron