Mine is in 4-6" of sand.
Per LA
The Yellowhead Jawfish is moderately hardy. It tends to be shy and is best kept with other docile fish. It will not bother other tank inhabitants, but other burrowing fish may bully it. It needs to be kept on 5-7 inches of fine soft substrate such as sand of various particle sizes (not fine). Known for being a jumper when startled or frightened, the tank should have a tight-fitting lid. This fish will spend much of its time in its burrow and when it does venture out, if it is startled, it will bolt back into its burrow tail first with lightning speed. As long as the tank is large enough, several can be kept in the same tank. Multiple specimens provide very interesting behavior as they "dance" up and down in the burrow. Supply various size rocks among the soft substrate to help reinforce the burrows against them; rockpiles are ideal.
