Question

Why does an aquarium need to be cleaned and water changed regularly?​

Answer 1

Answer:

In the Aquarium the uneaten food as well as the waste generated by the fishes mixes with the water and is left untreated due to the lack of decomposers. The waste materials thus accumulate in the water making it toxic. Hence an aquarium has to be cleaned after regular intervals.

Explanation:

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Answer 2

Answer:

we bring fish from sea to aqarium without their permission so its also our duty to let them stay in a hygenic water and place