I don't know all that much about them but heard there are a few different species called baby whales.
In general, they are nocturnal, eat live brine shrimp and live black worms. Best if only one per tank or in a bigger tank keep 6+.
I've heard that they have an electrical organ and are mildly aggro but are very aggro to conspecifics especially if kept in low numbers.
Hopefully others will be able to tell you more.