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With the right set up as has been suggested & no levels or anything they may get territorial over they can live successfully together, it's never certain so you are right to have concerns about fighting but it usually begins with a bit of squabbling & signs of bullying before a major fight breaks out so just keep a close eye on them & see how it goes, always better safe than sorry though so if you do see signs they they aren't getting on so well or one is being particularly dominant then it maybe better to separate sooner rather than later.