My hermit crab is de-stressing in shell grit!!?

My hermit crab is half buried in shell grit! Is this okay? I have got mostly play sand 3/4 of the tank and only 1/4 is shell grit( just so the water and food bowls can sit on top of the shell grit)
But now he is de -stressing in it! Will he be okay? Should I move him or leave him??
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