When I rescued a betta while back, I told them he was sick and I wanted to save him. I said he should be free because there is a good chance he will die. So instead they offered me 10% off and I took it. He died the next morning, he was too sick to save. I took him back to the store and demanded a replacement and looked for another sick betta but only found healthy ones since a new stock had come in. Took a pretty pasty white dalmation colored fella and when they told me to leave the dead blue betta, I told them NO WAY. I'm not letting you toss him out like garbage, he is going to have a goodbye ceremony at my house..
I got the "Crazy fish lady" look, but I didn't care. I did what I did and I dug a little hole and buried him out back. I wish I could have save him though; he deserved it.