Question Regarding Enclosure Size for Theraphosa Genus

[Brad Pard]

What enclosure size in terms of a tank would be suitable for any species of the Theraphosa genus?

 

[Liquifin]

That depends on the size of the specimen. Tarantula enclosure sizes is always dependent on how large it is.

 

[Spaceman]

Three times the legs length is one way of getting enclosures for T’s

 

[Brad Pard]

Basically, what enclosure size would be appropriate for an adult specimen of the Theraphosa genus?

To be more specific, which enclosure size would be better for any adult species of the Theraphosa genus: a 20 long gallon tank or a 40 Breeder gallon tank?