Is it normal for red ear slider to poop soo big?

Yes, it's normal for red-eared sliders to produce large feces, especially if they are on a diet that includes a variety of foods, such as vegetables, pellets, and protein sources. Their size can vary based on factors like the turtle's age, size, and overall diet. As long as the feces are well-formed and the turtle appears healthy, there is generally no cause for concern. However, if you notice changes in consistency, color, or frequency, it's best to consult a veterinarian.