Zebra danio fish breeding

Question
Hi Mr.Will,
This is riyaz... I've a 15 gallon community aquarium.. in which I've 4 angel fishes of 3 inch wide and 3 platies 1 male and 2 females and 2 zebra danios male and female(i saw in the net that the zebra having golden stripes is male and having silver stripes is female)this concern matches my fishes.. the female 1 was fatter from the i bought them before 2 months.. when i saw it last night,it was too much fatter than ever and when i see today, its become normal like the male fish.. there is no sign of eggs in the aquarium.. this had happened once before itself.. i'm getting confused of this.. i want to know what is happening to them.. is this normal or is that fish sick? i need your answers asap..

thanks in advance.. have a great day..

Answer
Hello,
I am willing to bet the fish are laying eggs. The problem is, they lay few very small eggs and everything in the tank including themselves will eat the eggs.
If you want fry, set up a breeding tank and I'll give you a more detailed procedure.