whats wrong with Emerald green catfish???, (except the possible 10cm size and need for at least 5)
had one (back when they were less common was awesomely friendly and used to motor round my mutant severum kinda like a baby cichlid feeding of its parent, severum liked it too.)
just remember Brochis splendens is one of those fish that look crap at the shop but are stunning at home.
also seems I have to work harder on my african tank to impress you. there is a lot more shapes and colours available out there, just not as common....