Hello, I was wondering if anyone had any advice about pistol shrimp. I love watching my goby and pistol shrimp burrowing under their rock together. The only problem is that the rock they live under is beginning to sink lower and lower into the sand, and all the other rocks on top of their rock have began to shift as a result. The more they dig, the lower the rock gets. I'm not sure if the images really show what I'm talking about. One is from a long time ago, and I just took the other one.
I figure that once the rock hits the glass at the bottom of the tank, it will stop, but I'm worried about the rocks on top toppling over while I'm at work or something before that happens. Has anyone ever had that problem? should I be worried, or am I just paranoid?