I am also gradually replacing the inhabitants of my 125 and 75 with medium size CA/SA. The replacement will be Cryptoheros species: panamensis, sajica and nanoleutus, Geophagus iporengensis and Red Ceibal, all max out at about 6 inch for male. They are all in my grow out tanks, approaching sexable size. The trick is to introduce them to my established tanks all at once to avoid aggression by larger tankmates, or tear one another one up in the future when they become sexually mature. Having kept mouth brooding Africans for a while, I am interested in pair bonding CA/SA for a change. By crowding a mixed group of similar size fish, I hope that balance of power and peace can be sustained. I'll provide pics or videos when it's done.