Is there something wrong with white zoos?

[Fish]

This isn't the best picture but the zoos on the left have solid white centers. I don't thing it is bleached due to lack of light or anything because the ones beside them have green skirts and light blue centers with pink dots in the middle so they are ok.??
The white ones are about as boring as you can get but they are starting to grow on me just 'cause they're different.



Hope this is normal .

- Chad