The back rocks are on the bottom but not the two front rocks.
The sand bed is a little under 2 inches.
And they are very difficult to keep. I have the luxury of working at my lfs so when we got him in I got him on to frozen food. Which isn't very hard cause they love to eat. But i got to watch him and fatten him up before I bought him.
They are pretty sensitive to parameters but the biggest thing is they like cold water. They like to be in about 68 degree water.
So they are really a species specific tank kind of fish. I have sexy shrimp in there with him.