Okay, so we're down to the oscar (7"), convict (4"), and salvini (3")...
Been about 2 weeks since my last update, and I've noticed some developments.
Convict is actually 'standing up' (sort of) to the oscar---I've seen him flaring his gills and shaking his head at the oscar on several occasions when he's (the con) ducking under cover and the oscar approaches. In response, the oscar opens his mouth and basically just sits there hovering in place---extending his fins and looking pissed off. Sometimes he'll just sort of 'back-pedal' and leave the convict be, but most of the time he ends up chasing after him, albeit briefly. He'll tolerate some 'posturing' on the part of the convict, but ultimately he's not gonna put up with any bullcrap either. And the convict knows it! Most of the time the con will get the hell out of his way and/or show belly.
Salvini has put some size on him---mostly thickening up.
He is mostly like the other sals I've had in the past in terms of hanging out under cover in an inconspicuous location. But unlike the other sals I've had (which were much more reclusive), this guy actually comes right up front and center whenever I walk up to the tank (in anticipation of being fed, no doubt). Matter of fact, all 3 fish come right up to the front whenever I peer into the tank, and they mostly ignore each other. It isn't until after the initial feeding that the convict starts chasing the sal back to his end of the tank, but even then the salvini only goes reluctantly and at the last possible second. Won't be long before he stands his ground, I'm sure.
In sum, after being housed together for about a month now, these 3 fish seem to have settled in. Dynamics are bound to change as the fish mature, I'm sure, but for the moment there certainly doesn't seem to be any cause for concern with this setup. We'll have to just wait and see what the future holds!
BV