You might want to get a few more opinions here, but it looks like something may be picking at it. I formerly had my sharks in my pool with a pretty wide assortment of fish, and noticed this exact thing. The sharks were in there for about a year and a half before I had any issues. After watching for a bit, I saw the culprit (small 3" pale lipped tang - fairly new addition) slowly approaching one of the sharks and picking at her eye. I wound up removing the sharks and placing them in a separate pool, as the tang was becoming pretty relentless about it. Because I have so many other fish in the pool, I figured that I would play it safe and relocate the sharks to separate systems rather than removing the tang, only to have another fish start doing the exact same thing.I just got home from picking up a super healthy Achilles tang and while I'm setting up everything and testing the QT I look at my shark as she was near me. I noticed her eyes look a little clouded and a red area in her eye. Anything I can do?
