If you dont care about the breeding side of things I personally dont think it matters as they will only really go after each other mostly, they dont even care about fry really. Then saying that if they wanna breed they will no matter who's in the tank at the mo I have peacocks and Johanni with mine. I have had lelu's,marlieri,front and pulchers at other stages as well.
Just my 2 cents :oops:
Oh and the peacock and johanni are both breeding and the duboisi when they want