We also had 2 red eared slider's, they are quite common in Arkansas, especially around spring time, we let ours go about 2 years ago, my wife just got tired of the up keep, she was constantly cleaning the tank every 7-10 days. They are dirty buggers, we got a heat lamp and everything, we were always vigilant that if the kids touched the turtle they always washed their hands afterwards.
They grow rather fast aswell, it was a cool pet, but too much up keep, we let them go at a local lake near by, was fun watching them eat minnows and goldfish we bought for its lunch, also gave it worms whenever we found some outside on the back porch

Gav