kyrocketscientist
if you go to http://www.hydrofarm.com look up air pumps the activeaqua AAPA3.2L 3.2liters per minute is 2 watts and that is plenty for what you have for basic aeration.
i personally use the AAPA45L 45liters per minute at 20watts it comes with a 6-valve outlet manifold. i run two air devices each on 2-50gal AND 1-90gal aquariums. i use one of those pumps with 6 airstones for a 1000gal FT.
doing conversions from liters to gals to cu ft can really get confusing; usually the piston type pumps are rated in cu. ft. per min. then there are the turbos that can handle several hundred outlets. there can be some confusion, in that most air pumps are rated in per minute, not per hour.
just basic aeration you can cover for about $10. you can go up from there depending on what you are trying to accomplish. i have a model AAPA110L pump on a 10" diffuser plate in a 2500 gal KOI pond i had built it for the 1000gal FT and the fish did not care for that much turbulance.