For the past few days we have noticed one of our neon tetras not schooling with the others. This morning during feeding we observed this one fish come up for food and noticed it's girth, it's quite plump and swimming with an irregular, jerky quality.
I was easily able to net it, which should be a sign itself, and isolated it from the other fish. Upon first putting it in quarantine, it "played dead" and rolled over on it's side motionless. After a few minutes and a gentle tap with a chopstick, it started spastically darting about and then settled on a plant, again listing sideways. It does not look good...
Here's a quick video
Notice how it is jerking movements and orientation, it's unlike any of our others.
I think we'll see what a day in the QB (quarantine bucket) brings