when questions come up about breeding, many people say get a certain ratio of females to males, but how can this be done if you buy them from a fish store? how can you tell?
i know there are a thousand diff types of fish, but lets talk about mollies, and malawi cichlids or convict cichlids
also what size tank would be good to breed...

mollies?
afra or lab cichlids (mbuna)?
convict cichlids?
platys?