Hi Rachel,
Depends on the age of the snake you get. A hatchling could live around a year to a year and a half in a 30 gallon- but growth rates vary. My Taiwan started out as a big hatchling and was about 4 foot at the end of it's first year. By the end of year two, close to 6 foot (I slowed down on feeding then). He's only grown a couple of feet since then (over the next 10 years). These are active snakes, and seem to appreciate the space to roam (and climb if available). Be aware that they do have a higher humidity requirement than most North American rat snakes, so you may need to partially cover the tank top to keep more humidity in the cage.
I suggest you invest in a set of hemostats or long handled tongs for feeding. My Taiwan will practically launch himself out of the cage to get his rat. He's great to handle once out and when food is not present. During feeding though- keep your hands well away from the prey item, as anything moving is fair game.
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Lora

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