I keep my lesser siren in a 15 gallon tank with a Duetto filter (not sure what number the Duetto is).. and an air-stone being pumped by a Whisper airpump. not sure that's necessary, but I tend to be cautious about things with gills.
bottom is silica sand with some large rocks in a pile (in front of the filter to reduce sand being pulled in). adn some plastic plants.
the beast stays burried in the sand most of the time and comes out only when looking for food.
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