You've got Molly's the orange ones black tails
a corydoras- bottom feeder
Guppies- ones with the fancy tails are males. plain withoud the fancy tail but same body are females
and it looks like some zebra tetras there too (ones with stripes)

if you don't seperate the males and females your gonna end up with babies. the other fish Will eat the babeis too.

p.s you shoudl put some fish gravel at the bottom for the corydoras