
They are great - I used them in my 20 gallon leopard gecko. They don't fill the bottom - I have a few inches all the way around - but they're firm and flat and seem to hold heat pretty well. When I unpacked it there were a few chips in the bag but they were intact and after a good rinse I was able to pop them into the tank comfortably. My Leo spends a lot of time on it.

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