Losing/changing colour

[ayla23]

i have 3 baby wild type axies and they have suddenly changed colour
i fed them saturday morning and had to leave them for a day, i come back to they (sunday night) and they have lose alot of their colour, they are nearly white?
why???

 

[Kaysie]

What temperature are you keeping them? What is their setup like? What are you feeding them? Do you test your water parameters?