This last March my tank was 40 years old. Thats not why I started this thread but I figured I would mention it because I know that somewhere on here there was a thread about it. I can't find it so I am putting this here. A few weeks ago I added one of those silly gobi/shrimp pairs. As soon as the pair hit the water, the shrimp lost the gobi and found a burrow of his own. I didn't see the shrimp for a while and figured he croaked but now I see him hanging out with this old guy pictured below. He lost his mate of 12 years a few months ago and I guess got bored. Now I see both of them digging tunnels. The shrimp starts digging and the gobi who is about 5" backs in and with a few swipes of his tail, cleans out a nice hole. I am glad they found each other and seem happy. Of course the original gobi that I bought with the shrimp is carrying a torch and is all alone. Poor little guy. This is the original gobi I got with the shrimp This one is about 12 or 13 and is the new buddy of the shrimp. He is about 5"