I've had my 1st CBB for a year and a half now he eats mysis and keeps my tank aptasia free. I bought a second one (in hopes of saving it) from a not so great source and he died two days later. I bought another one and he was eating mysis and was doing very well for a little over a month and then one day I never saw him again
I guess he died and the bristle worms ate him, but I still don't know for sure what ever happened to him, just that he disappeared.
I will honestly admit that even though I know they have a poor survival rate I do plan on getting one for my other 230g. The CBB's eat aptasia and I hate the look of aptasia and therefor I will always try to keep one in my tanks. I will do my best to pick out a healthy one and I will not buy one that isn't already eating, and if I even remotely think it's cyanide caught forget it, but other then that...