Ok, sorry for not adding these before. I couldn't find my MicroMate, but I have now. (yay!)
This was some months ago in his favorite little cave.
This one was taken mid July or so during tank maintenance. Still natural.
Since then the body has been loosing vibrancy over time. This not-so very good picture was taken last night before feeding. As you can see his fins remain true to their original color and are extremely virbrant and healthy(especially its pelvic fins. God they're gorgeous). His body, however, has lost alot of its luster. The golden belly is gone, revealing a faded black stripe. What's left of the yellow belly is fading out over time.
The aquarium is healthy, water parameters are normal, staple diet and feeds normally, and no signs of aggression in the tank or color loss in any others like this fellow. Other than this issue, he seems be swim about the tank as healthy and active as ever. It remains one of my favorites in the tank, it's personality is outstanding compared to the rest.
Im just curious as to why this happens and what causes it if anyone knows? I have seen so many go about the same thing, natural or problem?