I have five silver dollars. You will see two in the picture. One is the traditional silver, and the other one has different colors and markings on it. You will also notice the red orange tinge of the tail and dorsal fins and, the anal fin is more rounded and longer than the regular silver dollar ( though that is not visible in the pic ). Do you think I have a silver dollar that is mixed with either a Pacu or a black bar silver dollar? They were all purchased from the same place at the same time several years back. They have shown the color difference for years. Thanks.