Tinfoil Barbs ,may be an option (but you wont have any plants ) , or Red tail cigar sharks ( leptobarbus hovenii )
chalceus (whos got them??) not so good idea as lurks mainly at the top 8) , leporinus are interesting bottom dwellers , but will probably have ago at your senegal ,
you always seem to hear of Jardini living with Giant Gourami (which you have tried) :lol: