[rhino71986]

I have 5 rb's they are all between 3-4". The largest one i have is turning a dark charcoal black at night and losing all the red color. I am not sure if it is sick or if it is actually another species. It is the most dominant rb I have could it just be showing a dominant color?

 

[jackburton]

its a natural thing for piranah

 

[Mack]

RBPs do that.