It is absolutely up to you with what to do...
You mentioned that the prior owners said when they separated the two torts that one stopped eating;
It is not unusual, but very normal, for a tort to feel a little stress when their surroundings (enclosure) change...and each tort is indeed individuals and some are more tenacious than others... when you take in/on a new tort and set up an enclosure it is not unusual for a tort to stop eating for a few days up to a few weeks...so this may very well have been what the prior owner experienced and perhaps did not know this behavior and got scared that the tort stopped eating...
Regardless of what you decide to do dear...we all here do wish you and the torts all of the best...and the prospect of separate enclosures can be a bit trying especially if that was not in the original plan..so hey, we understand...
You mentioned that the prior owners said when they separated the two torts that one stopped eating;
It is not unusual, but very normal, for a tort to feel a little stress when their surroundings (enclosure) change...and each tort is indeed individuals and some are more tenacious than others... when you take in/on a new tort and set up an enclosure it is not unusual for a tort to stop eating for a few days up to a few weeks...so this may very well have been what the prior owner experienced and perhaps did not know this behavior and got scared that the tort stopped eating...
Regardless of what you decide to do dear...we all here do wish you and the torts all of the best...and the prospect of separate enclosures can be a bit trying especially if that was not in the original plan..so hey, we understand...