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Other Names: Algae bloom Color: Green tinted water Appearance: The water itself turns green. In severe cases the water may be so green that the fish are not visible. Cause: Suspended microscopic algaeExcess light, especially direct sunlightToo many fishExcess nutrientsExcess wastes Green water is usually due to either a significant excess of light (particularly direct sunlight), or a major water quality problem. Although it may look terrible, it is not toxic to fish.Cure: Blocking out light completelyDiatomic or micron filtrationIntroduce daphnia to the tankWater changes will reduce green water temporarily, but will not eliminate it. Completely blocking out all light for three days or more is very effective. The use of a diatomic filter will remove the suspended algae. If daphnia are available, they will quickly eat the microscopic algae, then in turn be eaten by the fish.Note: Water aggregators that profess to clump suspended algae and remove it are not effective against green water. Prevention: Regular water changesRegular aquarium cleaningUse of UV FilterAvoid direct sunlight on tankAvoid overfeeding fishDo not overstock the tank As with any algae, keeping the tank clean and performing regular water changes is one of the best preventative measures. Prompt attention to sudden algae growth will prevent more serious problems
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