Just relax, some of us are in different countries, some (like me) sleep in late.
Well, it's mostly up to your fishies if you need one or not. If you have a smaller tank (10 gallons per goldfish or less), I would say that yes, an airstone or an air toy is a good investment. Fish can die without enough oxygen, and if your fish are gulping at the top, they probably need it. Fish can also go blind or suffer brain damage, just like we can, so it's not only safe, it's humane. Air pumps are pretty cheap, and, if you can't find an airstone (although most places carry them), you can get a cute toy, like an air-powered diver or treasure chest, for cheap. Both look pretty cool and your fish will enjoy them- ours use their airstone as their private jacuzzi!