I have 2 Turtles in a fairly large tank and they have grown since last year. However it is about 6 to 8 weeks that they are not eating anything and they are not very active. Can anyone suggest what is happening and what I should do. The tank has a special dry part which they can climb up to via a ramp, but this part is glass. They do tend to go there often. Should I be covering the glass with anything like leaf or other warm and soft staff. I appreciate some help and advice.