I posted almost 3 weeks ago about my tangs one cloudy eye that looks kind of like a bubble but I can't tell because it constantly picks at the rocks, glass and sand. It hasnt gotten worse and it hasn't improved much besides me being able to see its pupil. When it's good eye is facing me I move my hand at it and its fins flare up, but when I do that on the bad eye it doesn't seem like it notices and may be half blind. What should I do? It's acting normal and it eats every meal. it eats everything I feed the other fish. I don't want to stress it out and it just swims all day and acts healthy and happy.