Hi all, I have had fish tanks for years, fresh water fish, got my first guppies about two weeks ago, put a nylon on my filter in case babies arrived, found some yesterday, went today and bought jar of baby brine shrimp and fry food, fed them egg yolk yesterday. all day found myself sitting, staring at tank, looking for babies, think there is 8. this is very exciting. fish store told me not to worry about having too many because they buy them, I am ready to give them away so I don't have them coming out my ears. how fast do they grow ? when can I tell if they are male or female ?Ty carol