When should i put my fry guppies back in my main tank?

my 5 babies were born on Feb 16th and the other 2 were born in Feb 18th and they are bigger then there were when they where born, some have some color on their tail and i can tell who are male and female, i have them in a small baita tank i had them in a breeder net for the longest time it showed they got bigger that way, i have a lot of foliage and a little hiding place for them to hide and im tired of keeping on changing the small baita tank every week so i was wandering if i can place them with the rest of them. i have read alot of stuff on the web about things and i just want to know what to do. also the babies are from a different breed of guppy their mother isnt a fancy tail guppy she is a i think a African guppy or something she isnt a fancy tail, the tank i got her from has the guppies that are smaller then the fancy tail, what should i do?