Tokay are super aggressive, just Google pictures of Tokay, 9 out of 10 their mouths are wide open....
Hello and welcome to the Gekko section of the forum.
Although I would agree that a Tokay would be aggressive toward a Golden, or most any other Gecko in the same enclosure, which is the theme of this thread, I would not mistake their defensive pose for aggression.
Tokay will first flee, and then some will, when 'attacked' from above, attempt to bite. Most will nip and run but a few may latch and roll.:evil::yikes:
The rest will eventually stop running away after a minute of so and hold a defensive pose. This pose, with mouth agape, is an attempt to ward off the would be attacker.:fight: It is also the first time most Tokay owners can get their Tokay to sit still long enough for a photo, hence all the photos of this posture.
It is also at this point, however, that most Tokay are actually settling down and can be slowly approached, gently petted from behind and picked up without being bit. :biggrin:
Oh, and I almost forgot, .....
Of the 300+ Tokay and 200 other reptiles here including a pair of 3 year old Nile monitors, my 5 year old male Red Costa Rican Iguana is by far my most dangerous animal. His bite would have removed one of my finger tips at the first digit last year had it not been for the fact I was wearing a heavy leather welders glove!