I've had two Siren intermedia for about a year; they are in a twenty-gallon tank with lots of vegetation and seem to be doing fine. They ate earthworms voraciously for a month or two, but then seemed to lose interest in them; they would either ignore the worms altogether or ingest a worm and then spit it out. I've tried guppies; they eat them occasionally, but for the most part the sirens and the guppies don't come into contact, because the sirens stay near the bottom of the tank and the guppies near the top. The sirens love small crustaceans, though: amphipods, isopods, ostracods, cladocerans, grass shrimp, and small crayfish have all been taken with apparent gusto. They also have eaten treefrog tadpoles, live bloodworms, and dragonfly larvae.

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