Going off memory here my brother had 2 turtles for 11 yrs....
Unless you are feeding turtles live food(fish, snails, fresh water shrimp) best to feed them on land as turtles are messy eaters and won't take them long to sully the tank. If they are box turtles they can live in multiple environments hot, cold, tepid so if tank isn't heated wont be a major issue. Turtles shed every few months so not unusual to find skin flaking off them.
Have a spot for them to sit out of the water and water depth should cover the shell maybe an inch or 2 for live feeding purposes. Even if not live feeding water should still cover the shell. Give them a hiding place like a shelf or plants for them to hide under both on land and under the water.
Hope that helps....
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