Air pocket for inverts?

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Calaustria

Feeder Fish
MFK Member
Nov 26, 2008
49
0
0
Hobart, IN
I know mini crabs need some land, and I just bought a pair. I have them in a small tank with a land area. I saw an air pocket at my LFS, and a picture of one on here somewhere. I wanted to make something like it. Does anyone have one of these, or any ideas on how to make one? Any help would be appreciated. Thanks in advance.
 
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