Right now that I know of I have 3 RCS out of 4 left, and my 2 amanos. My 2 ghost shrimp both recently keeled within days of each other. All levels 0 but they were in the tanks cycle time so they were prob pretty weak. They both started turning a more solid white color and then just died. They could have been old from the store as well.
Im prob going to get 2 more, I like having them.