In the back it's like maybe 1 1/2 2 inches but not more then that I couldn't get anything behind my rocks until I move them, still a little work to do it that means re scape! Fish might not be happy with a bare tank for a while but I'll leave a few hiding places. I have a rock wall on the back of my tank and my ricks piled Infront of it so it's hard to get at the stuff in the caves/ back.
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