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You can cut the ceramic tiles with a wet-wheel saw, but I personally wouldn't use them. It's not that I think there's anything wrong with them, it's just that they're quite heavy for a rack, and when positioned over heat-tape, they disperse the heat over a much wider area. That's okay, but it makes it more difficult to keep a thermal gradient in smaller enclosures.
I use paper towels in the shoebox tubs (VIVA select-a-size fits perfectly) and newspaper in the larger tubs. Occasionally I have kept them on coco fiber, but usually that's just for their humid hides.
That's just what I do, but I'm sure there are a variety of other ways that would work just fine depending upon your purposes and types of enclosures.
(despite the controversy, I just have to add that I do NOT recommend calcium carbonate substrates)
Thanks,
Paul
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