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Sounds like bacterial but not positive. Could be that the fish has been in a fight with one of the other fish. Even if they've always gotten along fine--that can change without warning.

Has the fish in fact stopped eating?

I would start out with a 30% partial water change using a good quality dechlorinator and siphon the gravel.
Then I think I would remove this fish to a hospital tank for closer observation and perhaps start treating with melafix. If the fins/tail are disappearing fast then you should probably treat with something like Kanaplex or a combo of Maracyn and Maracyn-two.

Robin

The addition of some aquarium salt at the rate of 1 tablespoon per five gallons may also help. Dissolve it first and add it gradually
 

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Hard to conclude too much from symptoms a fish has just hours before it dies but red streaks in the fins can sometimes mean ammonia poisoning.

You might test the main tank for ammonia and also check the filter(s). You want to make sure there's a good strong flow coming out of the filter return and also that there's no build up of waste on the media itself.

With weekly, 50% water changes and no other fish showing symptoms it's unlikely a water quality issue, but I would check just the same.

Sorry you lost the fish.

Robin

One more thought: large water changes are great, especially if they are done frequently, however if your source water has chloramines added to it or a high level of chlorine then it's very important to be using a dechlorinator that can handle these two situations--not all dechlorinators can. A older/weaker fish will have a more difficult time with water quality that 'bounces' with a large water change that doesn't have the proper dechlorinator.
 
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