Oh ya, sorry, forgot about the type. xD
They're guppies. I've got twelve of them in a ten gallon and I'd say they're about 1.5-2 cm long. All they have is black and sometimes if they're in the right light, they have a bit of purple around the gills, like their mother.
What does the mother look like? If she has colour on her body or fins, that will appear within a month or two after birth. If the only colourful markings they will have are iridescent scales, those tend not to show until the fish are nearly mature.
i have about 30 baby guppy fry.
and still more to come.
they come out see through and yellowey?
but there like clear.
mine havent got their colour yet.
sure it will be soon for you though.
xo