I acquired a Cumberland slider in August 2020. I have had her now for 2 months. she was in a tank about 10 gallons with 20 other turtle hatchlings, she was very tiny, the size of a quarter. Her shell now is showing signs of what I believe to be metabolic bone disease? I'm not sure. She has a basking light and uVB light, Her water temperature stays between 78 and 80 (because shes still tiny) her basking temperature sits right about 88 to 90゚. she basks regularly she eats fantastically and I place a slow release calcium supplement in her water. What else should I be doing? Or is this something that happened before I got her?