humic acid has a characteristic for seeping into water and turning the water yellow under an alkaline environment. It is more likely seen during the initial set up period of a tank, when Amazonia's black soil contains a lot of humic acid. Humic acid is a natural substance and it will not disturb the health of fish and aquatic plants inside the tank. But if you are not comfortable with the cloudiness of water made by humic acid, we recommend you to take out excessive organic matter by frequent water changes. It will help reducing the cloudiness of the water though the result differs depending on the growth of the plants and the frequency of water changes. You may also use NA carbon and let it adsorb humic acid dissolved into the aquarium water.
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