A friend from work has an extra tank that she used to house her pair of bearded dragons in while she was making thier bigger tank. Now she has no use for it and is selling it to me for $20. Its a 30g with a small heating pad stuck to the underside of it.

I was wondering if an adult leopard gecko would live comfortably in this tank. I've heard they are fine in a 20g and I'm sorry if I've posted this kind of question before. And if an adult is fine in a 30g, could a pair live in a tank that size?