So in theory between feeding various types of seafood and water changes the trace elements should be getting replaced and no need for dosing?No low level of a trace element will cause a shrimp to die in 24 h. So while you may or may not benefit from dosing, it is not the immediate cause of the shrimp issue.
I cannot answer if dosing will be helpful, but it is worth experimenting with it if you have any corals.