What type of shrimp do you have? Mine paired up within a day. I was concerned the watchman wasn't going to make it before I got the shrimp...it was getting picked on and wasn't eating. But as soon as I got the tiger pistol and they paired up, the goby started doing better.
These are phone pics from my galaxy S4... I was looking at the S7 yesterday. I wonder how much better the photos would be on the new model?