I know some people have used terra cotta with success. My big concern is 1st not cracking the whole thing when trying to cut the hole. Then I'd worry about getting it smooth enough. I guess you could use a dremel or sandpaper.
I've used plastic flower pots from Lowes and then just ran a flame over the edges to smooth them out.
I do want to try terra cotta someday though. I think maybe then my pastel male couldnt rearrange his tank every night by moving his plastic hides around.
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