we do not clean ponds or lakes, but an aquarium needs to be cleaned. why?

Its good to see that Isha and shrushti have tried to answer.

I would like to add more.

Aquarium is an artificial ecosystem, which contain fishes as living organisms. In natural ecosytems, other organisms are also present in sufficient number to maintain a balance. 

 In natural aquatic ecosystem, uneaten food or fish waste turns into ammonia, bacteria then convert these pollutants into non-toxic “nitrates”. So,  If water of aquarium is not changed regularly then wastes could accumulate to dangerous level, that fishes could even die.

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well not sure but may be...the fishes which are domestic (eg:gold fish) can survive in clean water only....n gets poisened due to the water which contains the waste of the fish..etc etc....just hitting a guess!:)

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 i think there exists some microbes or we can say decomposers in the ponds or lakes which clean it up.but this does not happen in the case of an aquarium.that is why we need to clean the aquarium.

not sure...but hope it helps........

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 thanks a lot everyone!

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