First off, WELCOME TO THE FORUM. Second, do you know about cycling? You will need to cycle your tank, before you add fish, or they will die. If you know a freidn who has a tankt aht has been set up for a while, as him for a used filter pad ( as im, just pulled out of the filter used), and sit it in your tank filter of just in the tank. If will cycle your tank in days if not instantley, or were talking up to 6 weeks before adding fish. When you say purple cichlids, are you refering to the " Kribensis Cichlid"? If so, you need 1 male to 1 female, or the other female will be killed. Kribensis lay up to 200 hundred eggs ( sometimes more) in a cave. The mom will fan the eggs with her fins, until they hatch, and the dad will portect the permieter. Then the baby fish will be wrigglers, in the egg sac weighs so much, they cant swim, they just wriggle until there egg sac is used up, THEN you can feed them. I would recommend a 30g tank for the babies, and feeding them BBS ( baby brine shrimp). You can eitehr htach it yourself or buy it frozen. i buy it frozen because its easier and better for the fry. Frequent Water changes and higher temp ( as in 78-82 degrees) means they will grow faster. You need to do weekly water changes for the parents ( by a gravel vac). The fry can take up to 4 months befor ethye reach selling size, up to 8 months to become mature, and up to 2 years to become "fully grown" . If you plan on selling them, locate a home owned pet store and ask if they will buy baby kribs off you, and if they will, you have a place to take them, if they wont, your stuck.