I would setup a camera to see what is going on when your not around. If you can get a few good shots of the fish it could help determine if it is sick or if another fish is picking on it.
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
I did just that this morning. I'm watching it now remotely, but lights are off. I've seen her once going through the back towards the left away from her spot.I would setup a camera to see what is going on when your not around. If you can get a few good shots of the fish it could help determine if it is sick or if another fish is picking on it.
Those pics were taken within 30 seconds together. While one looks like spots, other pics don't show those spots. I am pretty sure those spots are sediments or sand.In the third pic there are visible white spots on the tail and the last pic there are visible white spots on the belly.
If your not listening, what's the point?
Have you corrected your calcium and magnesium?