I have a beautiful Opaline Gourami who is in very good health; nice appetite, not sickly, nothing. Except for her mouth. Her lips appear to be a nice, pretty shade of pink, like she's just put lipstick on. Still, it's not swollen or anything, and like I say, she acts just fine. So is this normal, or do I have something to worry about? Or do I just have a weird gourami?