Remember, Mr. Schultz had a collection of around 1500 tarantulas so space was of the essence to him. If you start using too many aquariums you run out of space quick! Most of us that keep large collections use modified stackable rubbermaid containers that take up a lot less space.
Having a tank that is big is not harmful to a tarantula...but is very unnecessary. Even in the wild, most of them live in a space that is about 2 feet by 2 feet. For a the spider you are keeping, anything beyond substrate, a water dish, and a hiding spot is neither to the advantage nor to the detriment of the spider. It is for your eye and your eye alone.
The real setbacks of a large tank is that the ******* crickets have a lot more place to hide. They have killed tarantulas before so beware. The best way to combat this is to leave a small dish of dried oatmeal so that the crickets have something to eat while they are in there. A cricket that isnt hungry wont munch on your spider.
The other drawback is that its harder to control humidity levels in a larger tank. Some species are quite sensitive to humidity levels so it is something to keep in mind. However, none of the species mentioned here (namely, B. Boehmei and G.Rosea) are at all sensitive to humidity levels so that one is a moot point.
The only time you really NEED a large terrarium is if you are trying to keep a communal setup of avicularia.
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Yah but have you ever smelled cheese? Some of it stinks eh?
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