Question

Why aquarium should be cleaned rather than the lake and pond

Answer 1

We need to clean aquariums but not ponds and lakes because , in lakes and ponds , decomposing organisms are present which break down the waste material into smaller particles whoes nutrients are then taken up by the aquatic plants and animals. Thus inlakes and ponds they act as thecleaning agents.But in case of aquarium they are man made things they not have natural tendency to clean itself,they not have naturally grown microorganisms which act as a bio logical agents.