Supreme AP-20 Air Pump
Easily run 20 devices off of this. One sponge filter in a 20 is plenty for fry, I do it for smaller ones all the time. It also leaves you a few extra lines, BBS hatchery & such is something to think about.
Distribution depends on how close the tanks will be to each other. You also have to take into account potential future expansion. If you are totally sure this is the biggest you'll ever get, go with a pre-made manifold, and a roll of air line, provided the 9 tanks are on one rack;
12 Outlet Distribution Manifold I'd go with a pair of these, never heard anyone say they need less air outlets!
Deluxe Flexible Airline Tubing Buy as much as you see needing, plus a bit extra. Air line does harden, sometimes gets ugly, I just buy a roll.
If the tanks are spread out a bit more, or if potential expansion is a possibility, go with PVC & pipe valves. The brass hat valves are a bit more expensive, but offer better control than the lever valves;
Brass Air Valve for PVC
Look around, outfits like Jehmco sell pumps valves & manifolds;
Central Air Pumps
Air Accessories
Personally I'd go for the PVC & pipe valves, I've expanded a couple times, room is maxxed out now.