I have had a powder blue tang for about 8 months now and everything has been fine except for an ich outbreak in the past but that was taken care of. Now i discover him with his belly, face and lateral line pale and blueish white. He is swimming slowly and panting and lost interest in food. I do not think this is hlle because there are no wounds just lack of color in these spots. I have a lemon butterflyfish, sixline wrasse, coral beauty, 2 clownfish, royal gramma, psuedo strawberry chromis, and a lawn mower blenny. 75 gal tank, salinity and levels all normal. i will try to post a pic but i dont know how.