Aquarium Water Clarifiers Aquarium water clarifiers clear up water clouding due to biological blooms, chemicals or particulates. Aquarium water clarifiers are most useful for treating biological clouding, often caused by a surge in beneficial bacteria (related to sudden increases in organic waste, from overfeeding or fish death). Any time you experience cloudy water or green water, test for ammonia and increase aeration, as oxygen is quickly depleted by these nuisance organisms.
If you find yourself using water clarifiers often, you may need to clean or change your filter or filter media, use a diatom filter, or add a protein skimmer.
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