Came home from work today to a dead 6 line in my rocks. Not sure how it died. It always came out and ate when I fed the tank and grazed the rocks constantly. I added a small purple tang last night but not sure if that's who to blame. The last time (3-16-21) I checked my parameters they were fine. Probably gonna check them again tonight or tomorrow afternoon once I get home from work. I guess what I'm getting at is has anyone seen aggression from a purple tang spread to none tang species? In the picture is the 6 line, the other side of the fish showed no trauma. This side however looked to have a few scuffs. Not sure if it's from bumping rocks after it died or what. Also a picture of my parameters, tested with salifert kits.