They are not predatory but are pronounced scavengers. If given little choice though, can be opportunistic but have to be very hard pressed.
They don't look to be territorial or not much anyway, esp. in an appropriately large tank.
They appear to maintain a hierarchy among themselves but not too terribly viciously, if no one fights back too bad.
The complication is that their maxillary barbels span ~2x their body length. Hence, they have to be kept in tanks with widths of 3x-4x body length.