I agree nothing with your betta. A 15-20 gal is adequate for a breeding PAIR for cichlids, but its vital there are numerous caves in which one or other fish can hide. If you are new to cichlid species, I highly recommend doing your research. You would need to Vent the cichlids for breeding status, and that can be troublesome. You then must have a larger tank. 50 gal. is usually the standard.
I have a 60 gal, and have bred and kept Lake Malawi cichlids. These fish are semi to highly aggressive..however they are beautiful fish and can be worth it if you dedicate yourself to their health and care. :D