Why not another larger african? What are the dims on your tank is it a 150 tall or long??? If its long you have so many options. Is your plan to have a large centerpiece fish and many smaller fish filling out the tank? You could do a peacock/hap tank, you can google for those. You could do Cyathopharynx furcifer, look them up! There are so so so many options with africans its impossible to choose. I currently have 6 frontosa, they aren't "active" but they kinda take on that serine gentle giant demeanor of other slow moving cichlids like discus, angles, etc. I would propose you try mixing it up. I know that this goes against recommendations but my frontosa burundi are flourishing in a 86 degree tank with a orino pbass and bichir. I would caution against such extremes with the other deeper water frontosa and gibberosa strains but burundi are tanks. Just keep the water clean! Seriously thought the blue of the frontosa really pops against the green for the pbass.