My albi is about 10 inches my ornates are about 8-9 and my endlicheri is about 5-6 and these are tuff guestimations and my jewel has been with them for goin on a few months now. And never have I had an issue with it with any of my fish except the smaller deformed jewel whom he chases once or twice a day for a quick dash and that's it. I just upped my number of females today and added 3 more to the tank bringing my number to 4 females. Upon adding them he coloured up to what you now see. For the past few months he's been a di lol burgundy color. I know it's still young but there is a much larger dominant red zebra male who he has to worry about more who is the all around boss of the tank other than my polys he doesn't mess with my demasoni. But he lets everyone know he's the boss. My tanks a 6 foot 125 gal long tank with lots of rock and drift wood and I ll b addin more as I continue stocking.