I have a somewhat better bait tank set-up but have had similar issues. Biggest thing I've been able to do is not overload it in the first place. In my case even a half scoop of dines will be 100% dead in 30 minutes but if I get more like a quarter-scoop they will last all day.
Personally I just ask the bait guy to give me fewer. They won't charge you any less so if you want to get your money's worth bring a separate bucket to put the rest in, let them die without stealing oxygen from the rest, and use them for chum.
Good luck!
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