About a month ago my platy gave birth to I would say about 30 fry, out of which 15 were stillborn.
Now there appears to be black round spots on their bellies. I don't know if that is a problem or not
I could use some help
it could be their colouration is starting to change or develop more. Depending on the parents most platy fry will start to show similar colouring to one or both their folks within a few months.
As long as the fish are still feeding well then there is probably nothing to worry about