I've had multiple bettas in my life and even more various types of fish. My fiance got me 3 bettas on a whim last Thursday from PetCo.
Right now I am watching the last one struggle with life :( the other 2 passed today.
I'm so sad, obviously... I love fish! And my heart breaks for them. I wonder what I could have done to save them, but I'm not sure I could have. Something was off about 2 of them from the beginning, but the one that seemed fine was the first to go.
We are taking them back to PetCo tomorrow in hopes of recouping the money he spent, but I really don't want bettas from a chain store again. The ones I got in the past were not from chains either. I'm not sure if their policy is to refund or replace, I hope refund because I don't want to have my heart broken again so soon.