The fish tank

So I mentioned in one of my posts that Santa had picked up a fish aquarium for Isaac. I was reading the directions on setting it up and I came across direction #5. This is actually what it said. It read "#5 Be sure not to keep the tank too heated. Otherwise, it will have a fishy smell that smells fishy". I thought to myself, could there be a fishy smell that smells different from fishy? Could there actually exist a fishy smell that smells like cat spray? Or could there be a fishy smell that smells like elephant poop? Anyways, you get the point. Now every morning I'm going to be sniffing the tank to make sure there is no fishy smell that smells fishy.