You can place the net over the shrimp so it will begin building it's burrow where you want. You can also add food to the opposite side of the tank to distract the hawk.OK.... I wish I would have bought it already...
Going to have to figure out how I can introduce one to the tank without the hawk getting him
Perhaps I can introduce the shrimp while rearranging to make an area with sand at the same time.
I think I like the wrasse idea since it will sleep in the sand.