9 Red Eared Slider Tattoo With Certificates - Online Training Courses. Adult females are much larger than males and reach lengths between 7 and 11 inches. A good rule of thumb is to increase the tank by 10 gallons for every inch of your turtle’s size.
Both their carapace (shell) and skin. Females have more vibrant colors than males and will. It is the most commonly traded turtle in the world.