My freind betta, he has fin rot a few weeks ago. My friend was only treatment salt and keep water clean.
Last week, my friend has sick and he stayed in bed 4-5 days. He didn't take care of his all fish.
He got up the morning, and he found betta male was dead. The organ was out of his body. Have you ever head such story ?
My friend was really shocked, and blamed himself, if he didn't have sick, he could take care of his fish.
My friend has experienced a lot, maybe over 20 years. He never have seen such things.
Betta has strong disease ?
His tank was in only live plants(not sharp).