I'm glad this came up as I had toyed with the idea of getting another cardinal to keep the current one company. Wasn't aware that some just don't do well.

I've had mine for quite some time now, not a year yet, but will in Feb or March of next year. I do have mine in there with three tangs. When I come down in the morning (4am) I feed the sun coral, trumpets, and brain this guy is flitting back and forth I assume eating. He does come in for the occasional meal while I feed the herd of other fish, often darting into the food cloud only to disapear into his section of the tank.

I never really liked this fish. My sister bought it for the tank so I put it in there. It's getting bigger and doesn't appear stressed. Probably a tank bred fish though. Got it from AD.