Like others say, really depends on your individual GT. Some owned by members here are big puppy dogs and get along with everything. Others like the wild caught one I had wants to attack everything.
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Only 4in long and attacked everything else in the tank till I had to rehome him.
Did the WC one flare at you? I got a white saum in Feb, and the bugger challenged my kelberi (11.5") when he was (6.5") last month. It didn't care if the kel wrapped its mouth around its head during aggression, and was relentless. It would flare at me, so it has some major balls to it.