Thanks guys. I feel guilty as hell. The firefish was the second saltwater fish I ever bought. The tank is a 24 gallon Aquapod w/ compact fluorescents, and pretty much from day one I have kept the "feeding door" open on the top to help vent off some of the warm air generated by the lights. That, along with adding fans to the hood, helps to keep the tank at a comfortable temperature IMO (although I probably run my tanks a bit cooler than most who keep SPS corals.) The firefish had lived in this environment since I first purchased it, but I guess in all wild things, past behavior is not really any guarantee of future behavior.
I still think that firefish are great nano fish, in particular because it isn't often that one sets up a larger tank with completely peaceful fish that the firefish would feel comfortable -- and they are nervous fish. I will definately purchase another one; I just need to re-think everything and figure out how to best accomodate my future firefish's needs....
Thanks again... this is one of my favorite RC threads.