Due to the severe dropping, i transplanted the original rockwool to a bigger netpot. There’s a bunch of hydroton on the bottom to shield RW from splashes.
If your bubbles are popping under the net buckets (like water level is 1 or 2 cm under net buckets), the roots will grow down to the water. To take cause of them until that happens, top-feed water (soaking rockwool) once a day. I just pour some distilled water onto them, just a splash. The roots will grow down and into the basin.