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Were the people who gave you advice people who worked at a pet store? Pet store employees specialize in reptiles and fish, typically not tarantulas, that's why they tend to give lots of bad advice about their care. This is one of many reasons why I don't buy from them.
This is my enclosure for my 2.5 inch OBT. Since yours is 100 percent terrestrial unlike this species, you should put more substrate in than what I have.