peaceful fish

Does anyone have any idea of this fish... Its a yellow striped Cardinal fish... Found it in live aquaria page... i have a 29gallon tank.. and i want to keep only one of this kind not in group... is this a really peaceful one? any suggestion? :help...

I am going to set up a reef tank and after cycling and all that I'm adding my two clownfish to it. I am also getting a firefish (I had one but sadly he died a long time ago). I really want a larger fish to keep in the tank. This is what I want: -reef-safe -completely peaceful (won't harm...