I use to have a blue spotted jawfish. One of my favorite fish. I had a 2.5 in sand bed with pvc caves that I built for it. I also piled some sand a little deeper in some areas for it to burrow and dig in. They need lots of small bits of rock rubble or shells too. It was always busy building with the rock rubble. Every night it would take a piece of rubble and cover the entrance to it's burrow. It was so fun to watch. Be careful though if you have any corals on the sand bed as it will cover them with sand. And make sure your live rock is sitting on the bottom (the glass) of the tank and not on top of the sand bed, cause if they dig under the rock it will fall other wise.
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