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Crested Gecko.... all they need is branches to climb on and leaves or something to hide in.... baby food (and crested gecko food if you can find it), occasional crickets if you're up for that, a misting of water every day. That's it. They don't need a heat rock or lamp or special lighting or anything like that. They don't get very big so a ten gallon is an ok size.
Fish are too much trouble and money, and other kinds of reptiles need live food and a heat source.