Hi im Desarae, i have recently bought 4 turtles around april they all seem perfectly healthy except for one they are feed twice a day from 10:00am to 4/5:00pm im not sure if he/she eats as much but when i seperated them he/she seemed to be fine. He/she sits on the basking rock alot but tends to be pretty active while in the water i clean the tank almost every weekend and feel his shell it does not seem to be getting strong like the others he is very small and has not grown and inch in the last few months while the others grow bigger and stronger CAN SOMEONE PLEASE EXPLAIN!!!