I have 2 red empress that I need to give away. I listened to the LFS who said it would be ok to mix these 2 with my peacocks and yellow labs. I also have 2 electric blue johanii that I have heard could be a problem too but so far they are behaving. Have had all together for 4 months now in a 55 gal and Can see the Red Empress taking over the whole tank. If there is anyone in the NYC area thats interested in Adopting these 2 let me know.