Your cherry shrimp are likely turning white because they’re molting. Molting is a natural process in which shrimp shed their old exoskeleton and grow a new one. You’ll know they’re molting when a white ring develops on their bodies, typically near the neck area.
With that said, if every single cherry shrimp is turning white at the same time, there might also be something wrong. A sudden change in water quality or suboptimal water parameters can cause the shrimp to be sick and change colors.
Additionally, stress, diseases, and bacterial infections can also cause the problem to occur.
Lastly, it could simply be the result of old age. Cherry shrimp only live for one to two years. So if you’ve had them for a while, this may be why they’re turning white.