That's why I always laugh, when people say they have to be kept in a tank by themselves, they're crazy aggressive killers, etc...
The guy I got mine from, bought it when she was like 15". When I got her, she was 30" and I've had her for 7 years.
Never, in the entire time she's been in captivity, has she attempted to eat a tankmate. They guy I got her from told me she'd never once even attempted. And, as long as I've had her, she's never attempted.
Mine has been with everything from 3" - 4" fish, all the way up to 15"+ fish.
Now, if I wait a week or so, to feed her, she'll get aggressive during feeding time. When I fed, last week, she chased the Porc around the tank, but never would attempt to bite or eat it. Since I've gotten the Crosshatch, they've been sleeping right on top of each other. I've caught her, a few times, laying her head on the sleeping Golden Puffer.
In your other thread, where you show the pic of the one you might be getting...I noticed a Clownfish and a small yellow fish. If those aren't gone already, then you're good.