My coral beauty has an cloudy eye. My water parameters are fine. The fish is still very active and eats fine. I've been fedding it a balanced diet of flakes, frozen food (ocean nutrition formula 1 and brine shrinmp) and pellets. I have a 36 gallen and his tank mates are 2 damsels. What is the most common cause of this and how dangerous can this be. As i said before, his activities are still the same.