Hey WWW thanks for stopping by, I am not an HB expert yet but I do read alot, and from what I have read you are ok with the rockwool just water around it, and not directly on top of it so the cube doesnt get soaked, they can cause ph problems tho so be careful, I have also read that those jiffy pots work with this type of grow, and AG stands for Aerogarden, its a little all in one aeroponics unit........