I have some t. dobrogicus and am interested in breeding them. I've read that getting them to hibernate is the most natural (thus healthy) way to get them in breeding mode. However some forums speak of 'spontaneous breeding' in captivity. I would have some trouble with cooling the tank, as it is very large and consists of a land and water part. Would it be wise to leave the temperature as it is and just change the lighting period (making it shorter to match outside)? Or is getting them to hibernate a must?