Dang, I must have the golden horse shoe, I run a 55 gal aquarium with double charcoal filter( 75 gal filter I think ) and a single bubble stone, I keep 4-5 lbs on hand all spring, i may lose 10 minnows a week on a bad week, tank has been running this way for 3yrs except in winter when I just turn it off, I do change half the water out every 7-10 days and add the better bait chemical each time.