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Once in a while, one of my chromis gets the exact same thing.. It always seems to be happening to the "weakest link", they begin to slow down quite alot the group alienates it. All other species in the tank do not contract the same symptoms and are fine. I would QT and monitor, I did the same but was unsure how to treat.
Chromis is in QT and has never been exposed to main. It had a few specks on it so I treated with paraguard. Woke up this morning to it looking rough. What is puzzling is it is running down the lateral line but it extrudes from the body.