Most of the livebearers are super easy (guppies, swordtails, platties). Just put males and females in the same tank and you will get young. Remove the young or have hiding places if you want to keep the young, otherwise the parents may eat them. Kribs are also very easy to breed, and the parents will raise them for a while. I have bred the regular krib, pelvicachromis pulcher, as well as the more expensive pelvicachromis taeniatus "kieke". My pair of kienke will parent raise until they are ready to spawn again, then they will chase off the young. Interesting behavior, and less work for the breeder since the fish protects the young. Convict cichlids are also easy to breed.