Here are some ideas
African leaf fish (ctenopoma auc-something)
African butterfly fish
synodontis eupterus
congo tetras
Senegal bichirs
Maybe an elephant nose, I don’t have any experience with them so I’m not sure.
Brown african knifefish
It’s african themed
Gold fish tank?
You could do a cichlid tank. Severums come to mind but they’re a bit of a toss up for if you’ll get a peaceful one or aggressive one. Giant kribs wouldn’t be bad. Angelfish tank would be nice especially if you planted it. Discus tank would also be nice if planted.
You could make it a junk tank with no theme, my personal favorite way of stocking a tank, and just basically put random fish in. A severum here, a spiny monster pleco there, a school of tetras maybe, and a big group of african butterfly fish perhaps.