The Giant Gourami (Osphronemus goramy) is not really recommended for most hobbyists since the majority of home hobbyists don't have aquariums large enough to keep these giant gouramis. You're looking at a tank in the several hundreds of gallons at minimum to keep these fish. They can get up to around 27 inches as adults, with the more common sizes around 17 inches or so. They grow fast too.
The Giant Gourami is not a picky eater. It will accept most tropical fish foods including larger pellet based foods as well as crickets, worms, small frogs, smaller fish, etc. They will also eat vegetables like peas which may help with digestive issues.