Mysterious death...

Hi all,

Found my betta dead this morning and I have absolutely no idea what happened
Since I got him he earlier this year he has been great, behaving normally, eating, and no sign of disease.

Water parameters are fine; pH 7.6, Ammonia and nitrite both 0, and Nitrate below 20ppm. Water temp is 23 degrees Celcius which is normal for the morning, usually is around 24 degrees by night time. Tank had a water change earlier this week.

I've got some pics below of how he was when I found him, and one of him healthy and happy. Looks like there's this fuzzy white fungus growing on his body, that was not there yesterday. He must have been struggling to get enough oxygen by how his mouth and gills are

Would really appreciate any possible explanations you may have.
Thanks in advance.

Photo of him happy and healthy:


When I found him dead this morning:

I’m so sorry about the loss of your beautiful betta boy. Unfortunately, I know close to nothing about betta care and illness. I hope someone can help you figure this out!

maybe heart attack or stroke during the night

foxgirl158 said:

I’m so sorry about the loss of your beautiful betta boy. Unfortunately, I know close to nothing about betta care and illness. I hope someone can help you figure this out!

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Thank you foxgirl158, I am very sad about it since he was so beautiful and such a peaceful soul

Colin_T said:

maybe heart attack or stroke during the night

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Maybe, that would explain the sudden death.