It is still possible that one of the deaths could have been old age, but I do agree that that many... there has to be another reason. It is possible, since you did see some with labored breathing, they may have had gill disease, although towards the end the gills become inflamed. It was a tough one for me to diagnose when my betta had it. You could add some melafix/pimafix (even use them both at the same time) as a preventative for now... just one time to prevent any other deaths (hopefully).

Given your descriptions and water parameters, there's nothing else I can think of that would cause as many deaths as you've had recently. It almost seems like ammonia poisoning, but your ammonia level is fine. Seems like you give them a good, clean home and I really hope the deaths stop for you. If you do the melafix/pimafix combo, and your other fish are not in fact ill, it will not harm them in any way. They're pretty natural treatments.

I'm sorry I cannot pinpoint exactly what's going on; it's very strange to me.
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Phishie
Site Coordinator

"An ounce of prevention is worth a pound of cure."

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