Thanks much. Kept getting conflicting info on eupterus. Read on one hand some don't mind company and on the other they're extremely territorial (which I knew) but tolerate other synos. The straight info is appreciated.
For the record the syno fell into my lap a bit. I was at a pet store two years ago looking for the smaller, community synos from asia (and knew of the featherfin itself and was trying to avoid a mismatch).. same old story. Pet store employee was careless, I kept asking to make sure it was not a featherfin, and it was after all a featherfin. The fish was baby sized, very very small, so the large fin wasn't there otheerwise I woukdve known
I just lucked out since my tank is both fairly sized and basically empty so I kept him. He's had the run for two yrs so far