My 15yrs homes hingeback tortoise haven't been eating for last couples of weeks. he felt very light and eyes looked dry. no discharge from the nose though. so i soaked him in water ,i also added some salt & fruit puree in the water to get him extra minerals if he is dehydrated. he looked kind of relaxed and soaked for almost 6 hours. while cleaning the tub i noticed some slimy green thing in the water. i haven't fed him greens in last couple of days and he hasn't eaten in couple of weeks . not sure what that green slimy thing is. Do i need to see a vet ? please advise.