How big are they? Also if you have females I would not add another peacock, that would promote cross breeding. I have a group of red empress I can part out. $35.00 for a quad. Male is showing great color and they should be able to handle to attitude of lemon jakes. I wouldn't do a copadichromis from my experience. Lithobates would be ok, should be able to handle the lemon jakes as well.