My Six-lined wrasse has an odd, pinkish-orange mottling on it's entire body that has been coming on gradually for about a month. Is this normal due to age or diet? I feed thawed brine shrimp and a thawed spirulina formula daily. I have 5 reef chromis, a royal gramma, a tomato clownfish, a common blenny and a Pacific blue tang and none of them are having any problems. The wrasse is not acting unusually - just has a color issue. Anybody ever seen such a thing?