I have a painted turtle that is 20 + years old. I have always fed him floating pellets. Lately it has been Zoo Med but it has varied over the years. He stopped eating about two weeks ago. He has stopped eating for a few days before but never this long. I thought he might be having trouble with the large hard pellets due to his age so I bought some soft pellets but it sank and he didn't notice it or wasn't interested. I tried live mealworms and he really went after them! However, I know that his diet can't be only worms. He just seems to be picky. Any suggestions? I'm not sure why this change occurred suddenly.