Are you sure it wasn't a native?
Too late! Nah, I gave up, not enough money and too complicated. Handed it off to N1CK but still nothing.
Just the natives, best to do a cold water species tank, or maybe with some WCMM.
RCS are nicer IMO, but no, none of the tropical shrimp species. It's a shame, but I guess it's all for our ecosystem and what not.