They do fine singly or in pairs or trios...But do not fare well if you have other larger sized shrimp or boisterous fish in the tank. They do well with most gobies......I have a trio of them in a 2 gal PICO tank, along with a Yellow Clown Goby and another pair of them in a 2 gal pico with a panda goby and all has been well for many many months (10 months at least so far) Some places call em Sexy shrimp, some places say they are close but not exactly the same as sexy shrimp, but I have bought them indivudally listed as anemone and sexy and they all look the same to me and get along just fine.