I keep mine in a minnow pail with a battery operated aerator and I give them a shot of fresh air for 5 minutes twice a day. Also I keep them in a cool area and change the water every time I get to a lake for fishing. No tap water-contains chlorine. Right now some of them are probably 3 weeks in the pail and still doing great.
Reply by: cypher Posted: 1/9/2012 6:29:43 AM Points: 340
I had some minnows in my bucket from fishing Saturday and forgot them in the car overnight came out to the car on sudsy and there was 1/2-1 inch of ice covering the water in the bucket, they were all still alive and happy! The key is maintaing high oxygen levels in the water aerators work but cold water is dense and filled with oxygen so that's really all you need.