had the same problem when i bought a flame angel. wierd thing is that the angel died for some unknown reason in february, it's now august and the firefish hasn't come out to swim once! he's still alive cause I can see him pop his head out to feed. I read somewhere that blue reef chromis can coax shy fish to swim more. something about if other fish see chromis' (a prey fish) swimming, they don't think that there are any preadators in the area and they come out. don't quote me on that, I never tried it. I don't have any more room in my tank for another fish!