I did think of that JimD, Thank you. The ones you wrote about appear to have tiger stripes on the back and elongated white legs similar to a CB shrimp. Mine have all the distinct markings of a peppermint.

I did count the shrimp again and still have five in the sump. They haven't made it back to the display. Still weirded out by the whole thing. Maybe lack of sleep and cramming for tests have finally caught up to me