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Old 10-07-2020, 04:10 PM   #1
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Mysterious Cory deaths

Hi there,

I have an issue with my corys which started a while ago now. First noticed it when one of the Cory's was acting strange - lethargic at first and resting in odd places, then rapid breathing and laying at strange angles/ on its side. After a few days this Cory died. There were no physical signs of illness at all. A few days later another Cory started acting the same way and died the next day. This has now killed 4 Cory's, one by one. All other fish in the tank seem completely fine, and the other Cory's at the moment seem completely fine.

Tank is 50 gallons and contains 8 cardinal tetras, 7 ember tetras, 1 BN pleco and 3 amano shrimp. There were 7 delphax corys, now 3.

Water seems fine, 0 ammonia and 0 nitrite and 15 Nitrate. 24-25 degrees Celsius. Cory's are fed a mixture of wafers, bloodworm and pellets and seem to eat OK. Most of the Cory's that died were 2-5 years old and seemed healthy until recently.

Any idea what might be causing this and what I can do?
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Old 10-08-2020, 11:09 PM   #2
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Great job keeping the Cory Cats alive & healthy for so long. In the best of circumstances the life span of most Cories is 5 yrs.
Considering the tankmates are thriving, I suspect your Cories simply aged out.
A visit to the LFS always makes one feel better after a fish loss.
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Old 10-10-2020, 05:15 AM   #3
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Quote:
Originally Posted by V227 View Post
Great job keeping the Cory Cats alive & healthy for so long. In the best of circumstances the life span of most Cories is 5 yrs.
Considering the tankmates are thriving, I suspect your Cories simply aged out.
A visit to the LFS always makes one feel better after a fish loss.
That was my thought when the first two died as they were the oldest. The 2 that have died since were only around 2 years old unfortunately hopefully the rest survive.
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