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Why the aquariums should be cleaned by as regularly ?
The fishes eat and excrete in the same water  and there is a chance of nitrate build up which is harmful for the fishes thriving in it. Moreover when ammonia and nitrites build up there will be oxygen depletion.Changing water is important because for the vast majority of aquarium systems, there is no other way to remove nitrates from water. Every day, bacteria convert fish waste and excess food into nitrates, so levels are up. Plants or algae may consume some, but not usually enough to hold nitrate at steady levels. Nitrate is not tolerated well by marine organisms. It is a small system when compared to ponds.


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