Question about fish and air filters?

most fish don't need an air filter. i've never even heard of an air filter and i have lots of tanks going and all are healthy. head down to your local pet store and get a canister filter. they run quietly and make a little water fall that aggitates the waters surface to let oxygen disolve. then you just have to clean the biofilter part of it once in a blue moon in dirty tank water and change the carbon cartridge monthly. just make sure you condition the water and cycle the tank(this takes several weeks) before adding fish and you will be all good. also small frequent water changes dont' stress the fish if you do it carefully and refill the tank with conditioned water that is as close to the tanks temp as you can get it. i do weekly water changes but for some tanks every other week is good.