It is a 6 gal tank. By the time you have enough sand for it to dig burrows in and enough rock you are dealing at best with 3 maybe 3.5 gals of water. To suggest a ywg and shrimp is not a good suggestion. Besides he has brought back the damsel and got a much larger tank.
I guess you didn't read my current tank, it says 30 but after I measured it it's actually a 20 long. and quite overloaded. My 40 gal will hopefully be up this weekend and I can then add the rest of my new little friends.
Some of us wish to see a disaster not happen with a newbie and that is what I made my comment for.
Just because people do something different from what is suggested doesn't mean that it's wrong. It's adding caution on an unlikely probability!
