Where did you hear that? All 3 Giant Gourami types:The Gourami is meant to be a gentle giant, how does he cope with those other aggressive fish.
Neil the Brit
1.) Osphronemus goramy
2.) Osphronemus laticlavius
3.) Osphronemus exodon
All tend to have a nasty attitude sometimes, especially 1 & 3. The Red Tail Gourami is actually calmer than the other 2 but can sometime get nasty as well. I've seen Giant gouramis descale and kill other similar monster size fish as well.