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I've seen these caves come up in a few posts but a google search didn't bring up anything. What are they? Are they great? Where can I find them?

Here are where I have purchased some of my caves http://www.rosenthalpottery.com/cavecatalog.html

zcat,

There is a lot of breeding cave info under General Care and Breeding, titled Breeding caves.They are quite simple to make.
Dr Gribb has advertised his caves on this forum under Sales and Wants.

Regards,
Des.