However, here's some more food for thought.
In general, the salaries for PT are MUCH higher than registered nursing; i.e., they are more in line with mid-level practitioners, like NPs and PAs. Also, given your background in chiropractic and it's holistic approach, I am taking a wager (I'm from Vegas originally) that you are more inclined to prescribe/suggest natural modalities to your patients, rather than pharmaceuticals. Unfortunately, nursing has been reduced to little more than pushing pills in some settings (and is the aspect of the job I dislike the most). You won't have to deal with the administration of drugs as a therapist: whether physical, occupational, or speech-language.
While I realize that after finishing a 4-year-long professional program that having to do another 3 years may seem daunting, physical therapy, unlike nursing, is NOT saturated. Plus, your job prospects and salary would be much greater over the long run.
Also, working conditions for therapists are better: WAY more autonomy, still high but better workload, better hours for morning people (which I am not), and most weekends and holidays off (if that's important to you). As a nurse, especially in the beginning, you will likely work nights, holidays, and weekends, which is not for most people (though that's one aspect of nursing that I actually like. I like working when there are fewer administrators, vendors, physicians, and others around, because I have more time for patients!)