Advice for Platyaddict and Shawnie!
Livebearers are awesome little fishies! Platies and guppies are gorgeous to look at and really sweet! Hi-fin mollies and swordtails require larger tanks but are also gorgeous fishies to look at!
The main thing about livebearer parents is to decide wether they want babies or not. If they do, keep 1 male to every 3 females. If you dont then keep a school of males that will form a pecking order, which will prevent them from becoming overly agressive.
With moms and babies... Well, my platies never ate their young (which was a good thing). But to be 100% sure females should be placed in a breeder box or net. The babies will be protected that way since the time they are born.
After that is a good idea to keep them in separate tanks (rubbermaid containers make great hospital tanks) until the little ones are big enough not to be eaten.
They require a varied diet (adults and babies) bloodworms, algae wafers... when the babies are to little to eat normal stuff, I found Hikari's First Bites to be a wonderful food that makes them grow fast!