Amphibians do best when not kept in large groups. They breathe through their skins as well as their nostrils and so they can take in a fair bit of carbon dioxide. A general rule of thumb is no less than 10 gallons of clean air space per amphibian if an inactive species, up to 40 gallons of clean air space for highly active ones. Glass tanks don't allow for enough fresh air exchange so it's more than just a matter of enough comfortable living space, it's also an air quality issue.
FBT's kept in large group enclosures tend to have significantly shortened lifespans.
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