Pandas fly the Panda FedEx Express. Zebras get an airlift. But when Baltimore's National Aquarium needs a new shark, it's a great-white-size task. Why it matters: It's Shark Week, but don't bask by ...

But by far the biggest benefit of having live aquarium plants in your fish tank is the fact that they produce oxygen (O2) and absorb the carbon dioxide (CO2) and ammonia (NH3) that your fish generate.