I agree with duanes' input. I had a guttalatum for years that was one of my favorite fish, it's the fish in my avatar. It was on the "more aggressive" side of the spectrum for sure. It tolerated some smaller, tough tankmates, in a 6 foot tank. But if I remember correctly, it did murder a few things, until I found a mix that it liked. The guttalatum also grew pretty quicky.
How large did it get? Do you think a 6' 125g would work for a breeding pair?