RobertY said:Here is a picture of the bottom markings.
no its not. i had a red eared slider and have seen tons in pet stores. thats not oneThey are red ear sliders. Many times the red is orange or yellow. They may color up with time and proper care.
AquaKai said:Yellow bellied sliders and RES look almost exactly alike except the RES has a red "ear" and the yellow bellied slider doesn't. I'm pretty sure that the turtle is a yellow bellied slider because that's what mine looked like when I got it. Males get between 8-10" which is what that turtle was. I don't know the other turtles sex because you haven't posted a picture, but you're going to need a 60 gallon min with lots and lots of filtration!
AquaKai said:That looks like a female. They get to about 10-12" long. For your tank for happy turtles I would do 75+ gallon aquarium. Just pm me on post on here for any question as I have a yellow bellied turtle as well
Fishguy2727 said:That looks like RES, just light in the red. Yellow bellies do not have a big yellow mark the exact size and shape of the red ears of a RES. I haven't seen as many yellow belly hatchlings as RES, but I don't remember yellow bellies having as many markings on their bellies. That stomach matches RES.
I am not sure how accurate that sexing is. I have heard of that for box turtles because the males need a concave stomach to stay on the females while mating, not a big issue in the water.