The two sprouts that have emerged are starting to have their roots pop out of the rockwool cube...

I started soaking rockwool blocks in PH 5.5 water..

A few questions I really need to ask before I get started..
I have five gallon buckets, with net pots on the top (pictures below)

I'm not sure if im supposed to fill ONLY the net pots with hydroton, and leave the remainder of the buckets to be filled with nutrient solution (ebb and flow system by the way)

If the net pots were only to be filled with hydroton, then I would think it wouldn't be a wise idea to use the rockwool cubes, as they hold TONS of moisture, and will leave barely any room for hydroton.

But if I understand correctly, if I were to JUST fill the net pots with hydroton, the roots would grow below the netpot into the bucket-- But since this is not DWC, I would think the roots might dry out if there is no growing medium inside... Or would that mean that I would just need more frequent watering schedules? Again... lost with all this moisture the rockwool holds.

help