Not only do the images not show, but other than you telling us it's a "nice tank," I have no information on it. I know people who have very large 20-gallon tanks.
What size is it? What's the tank material (glass, acrylic)? What does "everything" mean? Lights? Cabinet? Canopy? Tops? Filter? Heater?
Not to sound too Sam-like, but if you don't make an effort to sell something, don't be surprised when it doesn't sell.