riverine means from a river in this case rather than a lake the majority of african cichlids come from 3 lakes malawi, tanganika and victoria.
malawi cichlids are by far the most common . you can keep cichlids from other lakes with them but you have to still be careful of size and aggression differences. rivereine cichlids i can think of are lumpheads and red jewels and kribs and can be kept with less aggressive lake cichlids
(though people will tell you about aggressive jewels, kribs and lumpheads )
perhaps an option for you is to have a male only tank with a few yellows and some peacocks but the size of your tank limits numbers some what