I use 3" rockwool cubes in a nursery pot of hydroton....I flood my table 3x daily for 15 mins during veg (lights on from 7am to 1am...flood at 8, 4 and
and 2x daily for 15 mins during flower (lights on 6 am to 6pm....flood at 6:30 and 5:30). Works for me, although many say I should flood less since rockwool holds moisture...I dunno....I am happy with my results and my roots are sick (in a good way).
I use 2 Wal-Mart dual outlet air pumps and 4 air stones to aerate my res (40 gallon size run with 25 gallons water...always kept full). Cost me 15 bucks for 2 pumps, air line and air stones.
My water comes up about 1/2 way on my nursery pots. I fill all the open space in my table with quart mason jars full of RO water. This fills in empty space so it take less water to fill the table and gives me a ready source of refill water when the level drops below the line.
Hope this helps you with any ideas. Peace!!