I have 4 JD 2 female 2 male. When I am not near the tank the females go from really light to really dark, and instantly back to light when im near the glass its really strange. I didnt know they change this fast. I hate the light color, any chance they will get darker as they get older. There are only a little over 2 inches now. The males dont get darker at all though? Whats up with this.