Question

we do not clean natural Ponds or lakes. But an aquarium needs to be cleaned regularly explain why why?​

Answer 1

Answer:

because it kill bacteria in aquarium

Answer 2

hi mate here is the answer

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An aquarium is an artificial system which is also incomplete due to absence of producers, food chains and decomposers. There is no recycling and self-cleaning. However, a pond or a lake is a self-sustained, natural and complete ecosystem where there is perfect recycling of nutrients.

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hope it is helpful