As wolf has mentioned. Convicts breed like crazy and they produce so many fry that you would be sitting on fish that you cannot move because everyone and their brother breeds them. Keep in mind that you will have an increase in electric bills, fish food, and all the time it takes to do frequent water changes. I have 20+ tanks up and ruuning and let me tell you its a big chore to clean and feed these little ones as they grow. Ive been breeding for 3 years and i have yet to turn a profit. all ive been able to do is break even after all the expenses of electricity, food, water bills etc.... The list goes on. If you do breed and sell for a small profit ide say you are doing good. Im moving around 100-150 cichlids a month to pet stores and online customers with very very little profit. Not trying to scare you away from trying, im just letting you know the ups and downs. And on a last note that if you want to start breeding fast the adult fish you purchase for breeding are going to come with a bigger price tag than growing fry out. Or just go with fry and wait months if not years for them to produce fry. Good luck....