Hey my leopard gecko is getting big for his enclosure that is about a 15 gallon tank. I am thinking about getting a 20 gallon tank. Is that a good size? This is the tank now.
In my opinion, a 20 gallon long (30"x12"x12") would be a good idea. I recommend that you ditch the sand. This is not what leopard geckos in the wild live on (hard packed earth in the wild. They are not native to the Sahara Desert) and there is a danger of ingesting the sand. Many people use coco-fiber as a particulate substrate. I like ceramic tile.