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I used to keep shiners and occasionally eels in a couple of old cast-iron bathtubs with aquarium filters and aerators. Anything smaller and you're committed to constant water changes. Also bear in mind that eels can escape from virtually any setup, and if one of them crawls into a nook and dies, you'll be lucky to get rid of the smell in a year. I used to work in a bait shop, and when that happened, there were days that I could barely keep from puking.
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