My blue crayfish was perfectly blue and the shell looked great. After his first molt, however, his tail began turning a reddish color and I notice the bottom part of his right claw was brown and cut off at the tip. I have him in a salt bath right now in case of shell rot, but I'm wondering why the tail is starting to turn red. If anyone can give me suggestions on what is going on or how to treat, it would be greatly appreciated.