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What types of fish should I avoid?

Knife Fishes

There are several families of fish from South America, Africa, and Asia, referred to as Knife Fishes. Many species of Knives get large, some over 3' long although some of the less attractive species stay as small as 8". All of them are nocturnal predators, a fact that many a beginner could have used before all of his or her small fish mysteriously disappeared a few at a time.

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