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Discussion Starter · #1 ·
Hi. I have an adult OB/Red Zebra, about 3.5" long, in my 55g all mbuna tank. The pH is 8.1, and Nitrates are under 15ppm.

Very quickly, over the last few days, it has developed the following symptoms:

1. Disintegration of fins, especially dorsal and tail.
2. Whitish/iridescent sheen on surface of body.
3. Apparent loss of movement of pectoral fin on one side of body (it's not using it and it is listing)
4. Sunken stomach, as if it hasn't been eating (not previously detected)

There are no other fish showing any signs of problems.

Wondering, what it is? How should I treat it? Should I treat the entire tank as a precaution?)

The only recent change to the tank is that about 2 weeks ago I added 4 small snails from an LFS cichlid tank (on their recommendation) to help cope with algae. I have had no other illness in this tank, except for a case of bloat about a year ago. The tank has been established for just over a year, and I have had this fish for the entire year - it was an adult when I got it, so I have no idea of its age - conceivably, it could be old - it's the largest fish in the tank.

Thanks!
 

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Discussion Starter · #3 ·
I wanted to follow up on the thread.

Within a few hours of my post the other day, we transferred it to a hospital tank and started it on Maracyn. But I think it was much too late. Within 1 day, the fish was oriented vertically and listing, and began to show what looked like blood colored streaks in its fins.

We decided to euthanize. In hindsight, I am thinking this must have been an old fish. I received it as an adult from a community tank, about a year ago, and had no knowledge of the fish, other than that it was full grown. So it's entirely possible that it was very old.

There are no other fish showing signs of issues. I do weekly water changes (50%) and biweekly gravel vacuum. And the nitrates are kept between 10-20ppm. pH typically 8.0 - 8.2, and kH around 12 - 15.
 
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