sexy shrimp

[pastout]

well my girlfriend had a sexy shrimp in her tank for a couple weeks now doing excelant by its self, so i decided to get here another one day before yesterday on my way home from work and she called me this mornign to tell me both her sexy shrimp had died overnight. is there any reason for this? can they not be kept in two's? the rest of the tank is doing awesome no problems at all