Today we acquired two red eared sliders from a woman on Craigslist. They came with probably $300 worth of stuff and we paid $30 for everything. Both turtles are bright eyed and active they look healthy EXCEPT for their shells. They're very brittle and flaking pretty bad. There aren't any soft spots which is some consolation I guess. They're eating commercial turtle food. I'm not sure what kind of light they were under. If you can provide me with any advice for caring for these babies, please let me know. I want to do best by them. The one turtle is giant and the other fits in my palm. Any idea to genders?