Clownfish changed

[rob92]

I was giving 2 good sized clownfish and both of them were orange and black like this

And now one of them looks like a regular occ clown

What happened???
And sorry for the quality of the pics

 

[booth2010]

Im not sure but I know someone else will ask this...
How long have you had them?
Has their diet changed?
What size tank and other inhabitants?

 

[Jonn]

Over what period of time did the change occur?