I have some mollies and livebearers in a concrete tank from just 5 black mollies that I have purchased from a pet store last July, I have seen several hundreds of them swimming .I feed them with fish feeds, some bread crumbs ,chopped vegetables and sometimes they eat mosquito larvae.
I started my hobbies at a very young age because my father also had some Aquarium tank.
I hope to post here always! Bye!