that's the way i feel with my oscar and his tankmates, as long as nobody is missing more than a scale or two, i let them sort out the pecking order and territories themselves. if i find that any of them are getting a lil grumpy and defending a certain area of the tank a lil too much i just re-scape the slate, fake tree stumps, and plastic plants to create new areas. gives the finkids a 'new' environment and satisfies my need to mess in the tanks, lol.
as for the markings on your new 'fish dog', lol, very nice! the reason mine got named Gus is because the markings on one side actually spelled out his name, at least until he nearly quadrupled in size and the 'letters' got stretched.