Why is my leather coral like this?

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Gza166

Aquarium Advice Freak
Joined
May 18, 2012
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ImageUploadedByAquarium Advice1396736725.053703.jpg y is the bottom section like that. Color is lighter and some of the little tentacles are like a purple color
 
In my opinion, I'd say because that little valley in his flesh doesn't get as much light/flow. I could be wrong, though.
 
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