Well I would definetly research some more and just think about fish that aren't too nippy or too agressive.
So u want Bad@ss fish maybe like peacock eel or bichir (careful some are nippy) blue ram cichlids (small not as bad@ss) u could take a risk with a parrot fish (start small) could do pictus catfish or African butterfly fish or gouramis(not the giant) some of the milder knifefish (African, elephant, etc) NO CLOWN KNIFE!!! IMO I think a school of small fish like tetras or something will look cool with a school of Cory cats on the bottom some Siamese catfish and blue Rams but u want Bad@ss and I gave u some bad@ss fish too. Also discus if u have money to throw.
Here are some BAD examples of tank mates:
Flowerhorn cichlid
Midas cichlid
Oscar cihlid
ALL MEAN CICHLIDS
Snakehead fish
Arowana
Payara (Vampire fish)
Piranha
On and on with obvious stuff like that
Here's my set up of Angels with an arowana and blood parrot and jack Dempsey
(DONT TRY THIS ITS A AWFUL IDEA MINE HAS WORKED FOR A YEAR BUT THE AROWANA COULD TURN ON THEM ANY DAY I AM TAKING A RISK)
Hope u find this helpful