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Originally Posted by mpodolan
Are you sure they weren't just cambarellus shufeldtii that were blue? They take on lots of different colors and patterns. I've had some pretty blue dwarfs over time
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you are right. Most of them lose the color. It seems to be something in the environment/food/defense mechanism.
I have one that is almost black color, but reverts to its ligh brown color once in a while.