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It is used for three main reasons:
1 - To keep the tank physically clean: for viewing (clearer water, removes fish poo, removes excess food)
2 - Biological filtration - this is key to successful fish keeping. All waste - fish poo, dead fish and decaying food release toxins (ammonia and nitrites) this is lethal to fish, the biological filter turns the ammonia into nitrites (also poisonous to fish). Finally the biological filter turns the nitrites into nitrates (which isn't poisonous to fish in small amounts) you keep the nitrates in check by partial water changes. For more info Read up on the Nitrogen Cycle.
3 - Water movement and aeration - a fish needs oxygen to survive.
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