Sebae clownfish turning black

[igor9040]

Hi,
I'm new to this hobby (1 1/2 yrs) and I've been asking to different petshops about this issue; however, no one knows.
I bought the seabae clown about a year ago. Two months ago I notice that the clown was getting dark spots, like bruces. Now, the fish is 40% covered.
What kills me is that he is eating normally and swims in the same way.
Last night i noticed something strange on the right side of his face.
I will appreciate your inputs on this matter.
Thanks.
Igor

 

[igor9040]

<iframe width="420" height="315" src="//www.youtube.com/embed/o5CsuK9IIPE" frameborder="0" allowfullscreen></iframe>

 

[igor9040]

<iframe width="420" height="315" src="//www.youtube.com/embed/lMVlWr9reC0" frameborder="0" allowfullscreen></iframe>

 

[igor9040]

<iframe width="420" height="315" src="//www.youtube.com/embed/rUVS5mohtTk" frameborder="0" allowfullscreen></iframe>

 

[igor9040]

I added a couple of videos.
The first one , so you can see the type of fish and corals I have.
30 gal tank
I'll give you water parameters in a couple of hours.
Thanks again for any input.

 

[igor9040]

<iframe width="420" height="315" src="//www.youtube.com/embed/hwPiH4SZPW8" frameborder="0" allowfullscreen></iframe>

 

[Deinonych]

Hard to tell from the pics. Could be hyper-melanization. Does your clownfish associate with an anemone or coral?