the one in ur pics looks so calm, mine is a super terror, the moment i put my hand in he is all pissed off and darts around like mad, its not that he's not settled, as he accepts pellets and other foods that are dropped in the tank.
That's how I handle my big cats, so much less work and less potential damage to fins etc then using a big net. Never done it with a Goonch but with large Planiceps/TSN/Piraiba. Great looking specimen.