I had a female reg and a male EBJD. I have kept JD's for most of my fish keeping untill I started getting into dats about a year and a half ago. The 2 I had were mating in my tank and the female was getting a little bossy so I let them go including the polys. My JD's never paid any attention to them.
I had one 10" JD (everything else half it's size or less), 2 senegals, 2 marble gobies, and two violet gobies and no issues. The JD grew up with a pair of clown knives.