Wondering why this Shrimp turned brown?

None of my other Blue Dreams have these brown splotches. When he arrived from the breeder (verified breeder in this sub), he was fine. That was a week or so ago. Just saw the spots this AM. She may also be berried but I can't quite tell.

Parameters: Hardness is 100 ppm, Buffer is higher than usual (180ppm), and pH is about 7.

Any tips on reducing the buffer would be appreciated too. When I Google reducing buffer, I keep getting tips on reducing the pH.