There are a lot of nice lake victoria cichlids, that grow to 4-6 inches, which you could keep in a tank like yours.
Malawi haps grow much bigger mostly.
Too big I am afraid.
my dear GermanDude i already mentioned that african butterfly fish is not available here, thank you i really like to keep them, but.....
galant my friend, thanks for the link, i will check it out
i already read the thread you linked but i am so sorry that is not useful for me, yes i know it is next to impossible to build a predator community or at least 4 fish, where stock is limited, , and that's why i'm here my friend, and i thank you for your help
Last Try: Acestrorhynchus minimus, or A. isalinae.
These barracuda tetras stay pretty small, are predatory and you could keep a group of them.
Over one billion live in India.
I bet someone has some for sale.