Well not to be a nay sayer, but you can't just throw three dozen of anything like that into a tank and have them survive for any length of time. When you set up an aquarium (basically thats what you're doing), you must follow certain rules that will allow benificial bacteria to grow and live off the load that you put in. A twenty gallon tank could never sustain that many eels. Even if you changed the water daily the work wouldn't be worth it IMO.
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