I hate when people say "It's just a..." about any pet! Working at the animal hospital, I hear it all the time about dogs and cats, especially from men. ;) Being an emergency hospital, we have to ask everyone that walks through the door what their preference is for CPR and if they'd want it done on their pet should it stop breathing during treatment. The woman almost always say yes and most of the men do as well, but there are a lot of men that will say, "It's just a dog" or "It's just a cat." Same goes for authorizing high priced treatments. I think if you feel that way about a fish or any other animal, then DON'T have it as a pet!!!
That brings up another pet peeve of mine. Why do people have dogs when they keep them chained up outside and never pay attention to them? That's a whole other topic... LOL