This is a new thread but the context is I recently got some online fish that were supposedly quarantined by the shop but about a week later they died. My preexisting fish have been fine. But I’ve been more hyper vigilant. I noticed my black clownfish has a white stringy poop. Swimming well put seems to be less interested in eating this morning. Usually will attack the surface but instead was just swimming about and would nibble at things that went down the water column. I’m worried and when I took a picture with bright white light the coat also looks funny or is that a lighting artifact? Any advice would be appreciated. Thanks. One photo with natural lighting. One with the white light.