What is up with my sebae?

Like about a month or 2 ago I got this sebae and his color was this nice orange light colored but every time I see him his color is getting darker and darker, the white stripes are still the same but the rest is an orange with a black color. Kinda like those halloween colors. Any info on whats going on? I heard that all clowns are born males or whatever and over time they change ---, is this is whats going on here? Thanks.
 
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