My yellow platy gives birth to yellow wag fry usually (she's had the same for the past two drops), but one fry is different. He was colourless at birth (the others were pale yellow), and now has developed a single vertical black stripe up the middle on both sides, and is beginning to show blue colouring. I'm wondering if anyone's had a platy like that? I'll try get a photo of him but he's fast and still quite small.