Wow, that is interesting Did you find anything else in the tank with this green growth (fungus?) on it? It seems to have a growth like texture to it as fungus would but we can't be sure unless there is more evidence/analysis. We have seen other shrimp with fungus growing on the shells and they return to normal after they molt Keep an eye on your shrimp and please let us know if this is the same case here.
as of a week ago it still had it. I decided to just remove the shrimp to be safe (removed to trashcan ). A few days ago I saw another one with the same thing on it. I didn't want to kill another one so I put it in another tank that currently has no shrimp (heavily planet, IE dosing, CO2, and fish though) so we will see how it does in there. I will have to check to see if there are anymore like that in there.