I have a 13 “ motoro marble stingray in a 360 gallon aquarium with a custom aquarium seamless sump 80 gallons, and a 57 watt uv sterilizer. The rage is recently within a week got cloudy eyes and now he doesn’t wanna move much or eat hardly anything. He was very active before. I don’t know what to do. I’ve made a 30% water change two days ago and then a 50% water change yesterday can anybody help me, please I don’t wanna lose him. Thank you.