In my small 15g tank the rockwork is only 2 or 3 peices high at the most, so when the pistol went digging nothing topled, but the rock slowly sunk. I ended up getting three small peices of plastic egg crate and placing it under the main rock where the pistl diggs so that it will stay not be undermined.
As for subsrtate you might be able to just add some small rubble to the area where the pistol is building. I'ts neat to see, my pistol actually places rocks and peices of shell around the opening of his burrow to make it more stable.
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