It happens sometimes. Ive seen lots of RDs change colors, especially when they are juveniles. Some are dark and some are light, and some dont even get red.
I have no idea what it is... Im pretty sure its a boy though. He has a nice water head on him also. He was sold in a batch with many others as Red Texas. He was the ONLY one of them to fade and turn out like this... I love his big white eyes... He is only less then a year old and BIG. I hope he gets just massive!