Well, platys aren't very hard to breed, as easy as guppys. For equipment you'll need a heater, a sponge filter lots and lots of plants, a light and gravel. Platy males are more tolerent of each other then, say,swordtails but if you hace to breeding males they will fight. To breed platys put a mlae and up to three females in the breeding/fry tank and let them do their thing. The male will chase the females and afterwards they will mate and after a few weeks the female will release the fry after which they must be removed so they can rest and so they won't eat the young. Never try and beed a pair, the male will court the female to distraction. The fry need small food to start such as our old favorite, newely hatched brine shrimp. After they get bigger they can eat pretty much anything that won't make them sick. As for feeding them to you're fish, I would put in a couple at first, if they get eatn and the other fish are still hungry feed a couple more until you find the exact number that the fish will eat. What are the fish you're feeding them to, BTW, I'd really like to know. I really like predatory fish.