If your leopard gecko is healthy and eating his tail will naturally be thick. Feed him every day for juvies and babies and every other day for adults. Remember to gutload your insects and dust with calcium and vitamins. Normal proper care should be enough to keep his tail the perfect size.
Gecko's tails become fat if they are healthy and well fed. It is important you know the correct cage temps, the correct substrates, the correct food, etc .... You get the picture, you need to know how to maintain a gecko to keep it's tail fat.
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Feed it.
