I recently purchased a yellow watchman goby with shrimp combo. I thought it would be fascinating to see the two digging tunnels and keeping watch. I added the two to my tank a couple of days ago. The last time I saw my shrimp was when I added it to the tank, it was on my live rock...I haven't seen it since. My yellow goby doesn't appear to have moved from his original spot which is under an opening in my live rock. Does it take time for the two to get acclimated to the tank or did I do something wrong? I haven't even seen the goby swim yet, he just seems to be content on the surface of my sand base.