Okay, I was just kidding.
Sounds like two things could be going on. First has to do with the natural conditions in a tank vs the ocean. Things change and grow differently. Some coral grow differently in our aquariums, than in the wild.
The second is something you might be able to do something about. It probably has to do with something lacking in it's diet or some mineral lacking in the water or both.
The white pigment in just about every manmade object is Titanium Dioxide. Is it possible that the shrimp uses the trace element Titanium from salt water to produce the white spots?
Is there some kind of food it eats in the wild which allows it to produce white spots?
I don't know.
I do know that lowered alkalinity can prevent the shrimp from being able to produce a new exoskeleton and thus prevent molting. Maybe slight variations in water chemistry can prevent white spot formation. How is your tanks alkalinity?
Calcium?
What are you feeding?
A third aspect I just thought of is the environment, ie. the lack of predators, mates, other shrimp friends. Perhaps the white spots are a kind of coloration that defines territory or attracts mates. When the need is missing perhaps the spots are discontinued?
Things for us
's to wonder about.