Yeah on a couple forums I saw people saying they think they're not as hardy as others. One guy said coral beauties are easier to keep than flames. And I've seen at least a couple threads online about people who've lost flames randomly. Try googling "flame angel died randomly" and maybe you'll find themHave you read that in more than one place?? Ive never come across an article explaining they die randomly but i have lost 2 flames that way
Yours could have been caught with cyanide. I bought a bicolor from a big box store and it died randomly too, so I figured it was caught with cyanide. It's a shame