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Will it eat my other fish?

Answer:  "Yes, probably"

Well not always, but then this is really a rather simplistic question. What most people are asking is "is it a community fish, and is it likely to attack my other fish if I introduce into my community tank?" 

This is an impossible question to answer without intimate knowledge of the particular community tank in question, and even then it still a matter of guesswork.  For that reason the only safe answer is "yes, it will eat your other fish", and for once I am not just being melodramatic.  Cruel as it may seem, in nature's food chain most creatures eat those below them in the chain, and in turn are eaten by those above, and this is certainly true for fish.  Big Fish eat Small Fish.

Equally important is temperament, and this applies to all parties, not just the aggressive species. While one or more hooligan fish can easily upset the whole tank, so can introvert and timid ones, and once the bullying starts it can easily spread.  True, there are examples of totally incompatible species which do live together, but there are far more examples where the smaller weaker fish get killed and eaten.! The best approach is to choose fish of not only similar size, but also similar temperament.

Just as a by line, it is not uncommon for small fish and larger fish to grow up together in a community tank without any problems. Then one day the owner introduces some new small fish which are seen by the larger fish as food, and promptly eaten. However, having eaten the new fish, the larger species quickly re-assesses its tank mates seeing them no longer as life-long companions, but as more food, and clears the tank!

Maroon Clownfish in an Anemone