I have a 125 gal 6 ft tank. Stocked with Labs, Red Zebra, Rusty, and some other kind of Metriaclima (Red Top Cobolt) and one Auratus. I am looking into getting a 6.5" Venustus and 5" Red Empress. How do you think they will mix with what I have? They Venustus and Red Emprss will be the biggest fish in the tank. I don't want to put my tank into terror mode....