You’ve a pond with an amazing diversity of specimens. One species of fish, however, begins to kill of its brothers out of territorial instinct, until there's only a few left. The remainder of these fish, let’s call them Hughemonks, begin to destroy all your other aquatic life forms. The Hughemonks digestive system leaves a waste that begins to poison those fish fortunate enough not to be eaten by the Hughemonks. You've run out of money. This is your only pond. What would you do about the Hughemonks? What you kill them to save the other life? Is there any alternative?