Question

we do not clean Ponds or lakes but an aquarium need to be cleaned why​

Answer 1

Ponds or lakes are a natural, self sustaining eco-system, while an aquarium is an incomplete eco-system.

Answer 2

hey mate!

we do not clean Ponds or lakes but an aquarium need to be cleaned because aquarium do not contain soil and decomposing bacteria which helps in degrading complex organic substances into simple inorganic substances and act as a cleaner.

hope it will help you mate.......❤❤