I want to know how one could call a firefish peaceful given how territorial they are. There really should be some mention of that. We have named ours Ursula - she is a purple firefish who is a giant bully to our pair of bluestreak cardinals. Now she isn’t out for blood like yellowtail damsels, but she is definitely a bully similar to tomato clowns. Does not tolerate certain free-swimmers in her territory. Doesn’t mind the other gobies so much.