That's the thing that stinks with keeping fish, even the ones that have bad success rates, it's seems like every once in a while, someone with no clue will manage to keep them alive and healthy. It's weird.
I literally debated for more than a year about getting a Mandarin, mainly because I didn't want to get a fish and slowly starve it over time, or have it decimate my pod population. I finally bought one 2 months ago at fishy business, and it's eaten frozen from day one. Crazy stuff.