Tank mates besides tetras

Can one keep small juvenile red tail shark or albino shark of about 2inch size with discus fish. I know they aren't native to Amazon and are territorial as they grow up but just for their bright colors can one keep just one red tail and one albino in a discus aquarium.

The sharks like cooler water., but if you keep the tank between 75 and 80 you should be okay.

That said I would use Hatchetfish, rams, or other dwarf cichlids from South America to give color.