Convicts are so easy to breed its not even funny. I have seen them breed as small as 2". Midas Cichlids are also very easy to breed but need way more room.
who the hell didnt know the answer to this ?. i mean if you dont know that convicts rule hands down as far as ease of breeding goes. i have seen 1.5" female convicts breeding regularly. as long as you have both sexes, they WILL breed. how about someone do an experiment and see if you can get them NOT to breed. hahahah