water changes(large ones) and a good variety in ther diet they will be 12 inches in less than a year i got a 2.5 inche and a 3 inch in may they both are 11+(but i do 70% water changes weekly and feed a variety of food)
imo its the fastest growing cichlid around,thats a reason why pet shops stock them alot,repeat sales,they look cute when small but as they grow you get feed up ect ,great sales fish