Funny, I happened to find this thread while googling "salvini tank mates" in an effort to figure out my tanks...
I have a 75g with a 2.5" firemouth, 2.5" polleni, and 4" male salvini (about 3-4 months) now.
The sal is the clear tank boss, so doesn't bother anyone. The fm flares at the polleni, who flares back. Looks to me like the fm is trying to act big and tough, but the polleni seems to know that he's more fish than the fm will ever be, so it doesn't bother him (or her?).
So, not sure if that helps you out, but thought I would share my experience. Good luck!
I have a 75g with a 2.5" firemouth, 2.5" polleni, and 4" male salvini (about 3-4 months) now.
The sal is the clear tank boss, so doesn't bother anyone. The fm flares at the polleni, who flares back. Looks to me like the fm is trying to act big and tough, but the polleni seems to know that he's more fish than the fm will ever be, so it doesn't bother him (or her?).
So, not sure if that helps you out, but thought I would share my experience. Good luck!