I've been using the Tetra AquaSafe Plus to keep minnows in the fridge all ice season, and it's really cut down on waste and hassle. I was skeptical the AquaSafe would work on chloramines in city water but it sure does. About 12 drops into a gallon jug with cold tap water and it's ready for the next water change. About 1 water change a week is all. Keep the water jug in the fridge next to the minnows so it's all the same temp and doesn't shock them. A lid on the bucket keeps it dark and avoids smell. A large strainer is also much quicker than a regular minnow scoop.