How deep substrate for pistol shrimp?

[davered00ss]

I'm thinking about adding a Yasha Haze goby and a pistol shrimp to my Biocube 32. substrate is about 1" now. Should I add more sand before getting them?

 

[Sugar Magnolia]

No, just add a bunch of rubble. Pistols like to use the rubble to shore up the entrances to their burrows.

 

[ZachsZoo]

pile up about 3-4 inches of sand and rubble in a corner, and use pvc pipe as a tunnel.