Hmm, I guess he's 4 inches if you don't count the tail...he sometimes looks like the top fin is yellowing a bit, like he's beginning to change, and then other times he just looks the same...I'll just wait and see. That's why I was wondering if you saw yours change to know if there is some pattern to how they begin to change color...like what changes first? If he does change, I will try and get serial pics of the change. thanks for the input...