clown morph

[Absint Reefer]

6 months ago I bought 3 tank raised percula clowns that were raiesed on farms under the solmon island suns. They were orange with a lot of black on them. A month after adding these I brought home one more clown that was just a regular tank raised percula with no color what so ever. 3 months into the combination of clowns the non-soloman island clown turned the exact same color as the others gaining the black around white arear and face.:eek2:
Why is this?
I thought they had to have sometype of uv light to do this?

Thanks,