Toey wrote:Yesterday only I brought pellets but what can I do if he is not eating that too
Turtles are cold blooded. Their body temp is mainly going to be the temperature of the water they are in, but they will bask to warm their temp above the water temp because they need to. They may need to raise it to help digest food or to boost their immune system.
If the water temp gets too low, their activity level drops; they eat less, and if it is low enough, they may even brumate (like hibernation).
In another post, you had mentioned temps of 60 - 65 F. That temp is very low. That will certainly affect appetite. It may affect health.