What Size Air Pump For Simple Hyrdro Set-Up

I was thinking of doing a basic 5 gal. bucket hydro system, I was wondering whaty size air stones and what size air pump would I need to have success with this set-up.

Thanks for the help!

JRF

The minimum is 2 6" air stones and a good air pump with duel output. 4 would be better they can run inline 2 per line.