Hosting onyx coloration

[Lmecher]

I have heard it discussed that onyx will loose black when hosting. Mine has been hosting a rbta for about 2 weeks and it has developed large black blotches all over the orange parts of it's body. I understand these to be a reaction to the anemone. Now this fish looks like it has some wierd disease, it's pretty ugly, has anyone else had this happen to their fish? I have seen much smaller and fewer black blotches on my hosting ocellaris. Just wanted to run it past you guys and see if anyone else experienced the same type of thing and if it will eventaully regain it's normal coloration, the black blotches on my ocellaris have gone away but they were barley noticable. I have photos of both sides of my onyx.
right side:

left side:

 

[joe1584]

Most likely it is still coloring up and that is just the black filling in. Im no expert but my percs and onyx both have that and they are both very young.

 

[Lmecher]

Here is the same fish about 3 weeks ago.

This is definately from the anemone not just normal coloring up, I just hope it won't be perminent. I don't want to remove the anemone but I am considering it, this fish looks like it has the black measles.

 

[joe1584]

my onyx looks exactly the smae and he is hosting a toadstool leather. so hopefully it is coloring up and not an irritation to the coral or anemone

 

[holdyourlight]

my rods onyx had these blotches like yours and i was hoping it was more black coming in, but it ended up just going away back to orange =(