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Sudden death of fish

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  • Regular Member

Technically a new tank (40-gallon) as it was completely restarted after the last of the previous fish had died. Four new small fish (a Comet and three Commons, as far as I can tell) have been put in, and were fine until today. This afternoon, one of the Commons was sitting on the bottom, breathing rapidly, indicating that it was stressed for some reason. A few hours later, it was dead.

Ammonia = 0

Nitrites = 0

Nitrates = 5

pH = 8.0 (since brought down to 7.8)

The other fish are still fine and are constantly DEMANDING to be fed!

Edited by Bob the Goldfish
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  • Helper

Huh.  Can you fill out the diagnostic form and give us as much detail on the tank schematics and history of the health of all the fish involved? More detail is better - this could just be sudden and random, or it could be something to worry about that is environmental or pathogenic.  It doesn’t look like basic water quality, just from what you’ve provided, but some hardness data may be needed if you can get it.

Test Results for the Following:

* Ammonia Level(Tank)

* Nitrite Level(Tank)

* Nitrate level(Tank)

* Ammonia Level(Tap)

* Nitrite Level(Tap)

* Nitrate level(Tap)

* Ph Level, Tank (If possible, KH, GH and chloramines) 

* Ph Level, Tap (If possible, KH, GH and chloramines)

Other Required Info:

* Brand of test-kit used and whether strips or drops?

* Water temperature?

* Tank size (how many gals.) and how long has it been running?

* What is the name and "size of the filter"(s)?

* How often do you change the water and how much?

* How many days ago was the last water change and how much did you change?

* How many fish in the tank and their size?

* What kind of water additives or conditioners?

* What do you feed your fish and how often?

* Any new fish added to the tank?

* Any medications added to the tank?

* List entire medication/treatment history for fish and tank.Please include salt, Prazi, PP, etc and the approximate time and duration of treatment.

* Any unusual findings on the fish such as "grains of salt," bloody streaks, frayed fins or fungus?

* Any unusual behavior like staying at the bottom, not eating, etc.?

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  • Regular Member

No medication was ever put in.

No strange markings or anything on any of the fish.

Filter = AquaClear 70-gallon

No water changes as of yet (have had new fish for 11 days).

Fish are fed Tetra Goldfish Flakes twice a day (though it would be constantly if it were up to them!).

Water temperature = 75 degrees (same as room temperature)

Current pH = 7.7

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  • Helper

Were all the fish put in this tank at the same time and this is essentially their quarantine period?  If so, I’d lean more toward the do nothing side and just keep an eye on the other fish. If symptoms don’t pop up, that one was likely already sick or weakened and the stress of coming home and entering a new environment was just too much.

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