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I was under the impression that you cant house T's together accept when they are breeding. Do they have to be siblings for this to work or all the same sex? Very impressive set up btw.
Some spiders can be housed together as they are considered tolerant, but at a drop of a hat it can turn ugly and you could end up with a massacre. Poecilotheria are one of the Genera considered to be tolerant, but it can turn bad very quickly. Best is to use spiders from the same sac and offer them limited space so that they can't create their own territories. And to try and keep them well fed of course.