RIJIMMY, I know how you feel. Had the same problem when the city switched to a Chlorimine solution in the water and lost a dozen a couple days after the switch.
Next I kept them in my live well on the boat with out live well pump running, lasted for ever changed the water every day no aerator. Bought another couple of dozen, left in live well, was working great, that is until I put a half dozen live macks in with them, docked the boat and was going back out about 3 hrs. later. Shut the livewell pump off went and did what I had to do, come back to boat and everything was dead. The macks must have sucked up all the oxygen and that was in a 55 gal. drum.
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