I would personally say they "could" live in a flexarium, but it wouldnt be a good idea. As with a vivarium they will have more privacy to feel secure, where as similarly to a fish tank the flexarium will be very "open". Heating would probably be a bit more awkward with a flex also.
they're too hard to keep at the temperatures a beardie needs in my opinion. they are cheaper to buy than a normal vivarium but will cost u more in heating in the long run.
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