He definitely gets darker when he's eating. He's about 3 1/2" now, including his tail which is fanned... not any forking at all that I can tell. His tail is mainly red with some blue dots on it. He doesn't have any kind of line where his mouth is, but there is a dark line a little below his mouth.
The picture I posted is about the palest he ever gets... I'll try to get one of him darker.