No it's a bad idea
1- Argentine Tegus come from argentine. Savannah monitor near from africa, a completely different continent
2-Tegus and monitor do not have the same temperament.
3-They do not see each other naturally.
4-a 6x4feet enclosure is too small for both of them. You would have to take in consideration that each other need their private space. You would need a 12feetx4 feet enclosure.
For both of your animal health, it would recommand not to house them together, even if they are "friendly".
0.1.0, 2007, Bearded Dragon (Uresaii)
1.0.0, 1999, Hermann Tortoise (Tama-chan)
0.1.0, 2007, Redfoot Tortoise (Kame-chan)
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