The first thing to get resolved is the size tank your talking about. IMO .. if it's anything smaller than a 75gal ... your asking for trouble. They are very territorially aggressive. Literature tells you RTS's are mainly aggressive towards other RTS or similar looking fish. I'll tell you an RTS can be aggressive to any fish it deems in it's territory, or during feeding.
Setting up territories via plants, DW and rocks will help and you may get one that is not as territorial ... but there's no guarantees. It may help if you start with a Juvenile (which most LFS RTS's are) and let it grow into the tank and its tank-mates.