The binary code is right, i used hydro for a long time and a too strong pump will ruin your growth and electricity billy i would definetly let it run a minute every few minutes, but more like every 10minutes imo, but depends the effectiveness of your system, you have to find that out for yourself i guess.
using airstones can higher you pH and if you go too far, you will have a pH your plants dislike. So check that too