I quit using the aerator....the noise rattled my entire boat and let the sacs know I was there...and I tried several....I picked up on Slab's idea of adding ice every now & then...cools them off and adds oxygen....also I add that blue stuff in a small bottle....8 drops with every new bag of shiners I add to my insulated shiner bucket...seems to work...I leave them in the air filled plastic bag till I get low.....