Pet turtles require a balanced diet that includes a variety of foods to meet their nutritional needs. They should be fed a combination of commercial turtle pellets, leafy greens (such as romaine lettuce and kale), vegetables (such as carrots and squash), and occasional fruits (such as berries and melon). Additionally, offering calcium supplements and the occasional treat like live insects or small fish can help ensure they receive all the necessary nutrients for their health and well-being. It's important to research the specific dietary requirements of the species of turtle you have, as different types may have slightly different needs.