Need help with mystery noise

[pirate]

When mine was in my biocube I saw him regulary, but now that I moved into the 150 G I havent seen him at all. I dont even know where is burrow is! I know he is still alive as I hear him clicking. I also did not see the gobi for almost a month when I added new fish to the cube and its been almost another month with out see him in the 150 G, I saw him for the first time in almost 2 months at the start of the week.
If its a pistol shrimp you will not see him unless he is paired up with a gobi. But there is no garrinty you will see him after he is paired up with a gobi, they could only show up behind the rock work where you wont see them.