donr,IVE FOUND OUT BY USIN BAIT SAVER AND KEEPING MY MINNOWS IN MY FRONT LIVEWELL,THEY SEEM TO LAST ALOT LONGER!KEEPING THEM IN THE DARK CAUSES THEM TO USE ALOT LESS OXYGEN.EVERY 2-3 DAYS I DRAIN PART OF THE WATER,ADD NEW SAVER,AND GIVE THEM A LITTLE GOLDFISH FOOD! NOW I BUY 5-6 DOZEN AT A TIME BECAUSE I KNOW THEY"LL KEEP!! GOOD FISHIN TO YA!!