I would say expand on the Clown Loach and Congo Tetra theme, go for a full-on African river biotope!
		
		
	
	
 
- Butterfly fish
 
- Alestes Tetra
 
- Yellow-tailed Congo Tetra
 
- Distichodus species (single as not social?)
 
- Bushfish
 
- Filter Shrimp
 
- Debauwi catfish
 
- Lionhead Cichhlid
 
- Thomasi Dwarf Cichlid
 
- Spiny eel
 
- Transvestite Cichlid (? Only reach ~5cm but they are supposed to punch above their weight. Might leave lasting impression on others if everything bought as babies, so as adults they remember this fiesty little fish)
 
- Syndontis catfish
 
- African Barb
 
- Harlequin shark (single specimen, my fave LFS has a tank of these, but not researched them yet... WOULD NEED GOOD COMPATABILITY CHECK, as can be bullies and they grow to ~15cm
 
- Knife fish
 
- Tilapia
 
-  etc. etc.