We use flip clips which are 1/2 oz weights. This past weekend I filled the live well, plugged it, because mine will slowly leak out, added a bag of ice and a 1/2 oz of U2 treatment and bubbler or O2. As the day got hot started adding a little more ice. Fished from 6 AM - 2 PM and at 3 PM I could hardly catch the darn fish to get them out of the livewell.