Shrimp that white ring in the first two weeks you receive them are likely due to age, the breeder using improper nutrition or water parameters, or you didn’t acclimate them to their new water slow enough. How long did you take to drip acclimate?
What is your KH, GH and TDS? What were the breeders KH, GH and TDS? This will help to determine if osmotic shock is playing a part.
Zealousideal_Dare265 
Shrimp that white ring in the first two weeks you receive them are likely due to age, the breeder using improper nutrition or water parameters, or you didn’t acclimate them to their new water slow enough. How long did you take to drip acclimate?
What is your KH, GH and TDS? What were the breeders KH, GH and TDS? This will help to determine if osmotic shock is playing a part.
Probs a failed molt. Test your kh and gh with a liquid test kit. You could also take a water sample to LFS and ask if they can use their liquid test.