Polarhound wrote:

Just about anything put into the tank with my buttikoferi would be
chunks of fish guts within hours.

I need to correct this earlier statement of mine.

My 4" Buttikoferi has been co-existing well with a 3.5" Leporinus. They
both have their territories (The koferi can't fit into the Lep's hiding
spots) and they often swim together in the tank with only occasional
chases along the lines of, "I think I want to be where you're swimming,"
movement which has been done by both of them.