I'm curious if a yellow watchman goby and tiger pistol shrimp would be okay in my 28 gallon bullet shaped tank.
Yes, it should be fine as it is not a water column fish. However, pistol shrimp are constantly moving sand to take care with any corals on the bottom.
I have seen recommended tank sizes of 10, 20 and 30 gallons for them.
The other occupants of the tank are:
2 ocellarius clowns
1 Hector's goby
1 emerald crab
3 nassarius snails
The Hector's goby does not stay in the sand, instead he swims constantly in the rocks, picking at algae. and copepods
I do have some corals on the ground, which I realize I might need to elevate and attach to some flat base rock.