I bought this mated pair to go with a largish pistol shrimp. They found him immediately and all seem happy. I'm wondering if they are different colors because they are male and female or because one is a Yellow Watchman and the other is a Blue Spotted? Neither of them are as brilliant yellow as I've seen online. Colors are perhaps better seen in the video.
https://youtu.be/jwz4erjZYtY

https://youtu.be/jwz4erjZYtY