Question

we didn't clean Ponds and lake but we clean aquarium why ​

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.

Answer 2

Answer:

In an aquarium the uneaten food as well as the waste generated by the fishes mixes with water and is left untreated due to lack of decomposers . the waste material thus accumulate in the water and it water toxic also . so the aquarium should be cleaned