My Florida gar looks like she has a long, brownish-pink furrow running for .5 inch on the underside of her jaw. There are no problems with the tank, I've had her for about 3 years and have not introduced anything new into the tank for a year. Water tests fine, temperature stays between 79 and 81. Any ideas? I will try to post a photo but she seems to know when I'm trying to get a pic!