Mine is going on a couple years now, he's maybe 12-15mm in diameter.
I made a beautiful rock scape around a hidden labyrinth of 1" pvc but he shuns it. Prefers the natural caves in the gaps between rocks. Luckily my rocks are literally cemented together so collapse is theoretically a low risk.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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