Easy way. Aquarium pump with 2 outputs for hoses. 1 or 2 5gallon buckets with holes in lids. Dozen in 1 bucket, dozen in other, you can divide by size of eels. Run hose thru hole in lid into bucket with stone. Same for other bucket, or put both hoses in 1 bucket. Change water accordingly, I usually do once per day to keep smell and temp down. Should run about 15$ for setup.
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