Originally Posted by malonlonlon
Yeah it wasn't until I saw his dead body until I got to actually see that he was like deteriorating.
I wish I knew what I did wrong.
It isn't necessarily something you did wrong. Sometimes they just go and no matter what you do, it still happens. Fish are funny creatures at times. A long time ago, we got two goldfish at the same time. They were the same age, ate the same things, lived in the same large tank. One lived until he was 9, one died suddenly after 2 years. Don't give up on bettas because you've hit some rough patches. I'm sure you take care of them just fine. It's just the way of fish sometimes.