The arrival of alien species is very damaging to the ecology

But the disruption of a natural ecosystem by an introduced foreign species can have unpredictable and uncontrollable effects that may not be immediately visible. So when Culerpa taxifolia was discovered at Carlsbad's Agua Hedionda Lagoon, near San Diego in the year 2000,having most likely come from the dumping of home aquarium water into a connecting storm drain, it was decided to stop it before it spread.Tarps were placed over the Culerpa colonies and chlorine injected inside. Although this method killed all other marine life trapped under the tarps, it did succeed in eradicating the algae and native eelgrass was able to emerge in its place.