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Why is this a problem?
Sunlight is the main source of energy for algae growth. The bulb in the light unit is designed to simulate daylight without encouraging algae growth. However, if it is left on for excessive lengths of time it can contribute to green water.
How can I prevent this?
The light unit should be left on for 6-7 hours a day. This will benefit real plant growth without encouraging green water.
How do I get clear water again?
Use a Reef One cleaning pad to wipe algae away from the sides of the aquarium. The algae will then be trapped in the filter cartridge.
Keep an eye on the filter cartridge - as the sponge gets dirty remove it and wash it under the tap. By keeping it clear it will continue to trap the algae.
Carry out a series of partial water changes. Continue until the water is clear.
Do not replace all of the water in the aquarium as this will cause worse problems.
For more information see:
cleaning your aquarium