Hi. Any advice would be nice as my knowledge ain't to great on aeration. My current setup is a 30 gal fresh water tank, with a canister filter and a undergravel filter and air stone run by air pump. I have had many different air pumps over the years and non of them have been really quite. I was thinking of ditching the air pump altogether and get a power head on the gravel filter with a venturie for air. The question is are power heads silent will one provide enough oxygen if so can someone recommend which one to buy. Thanks