back to green water

Why is this a problem?

The purpose of partial water changes is to dilute the level of nutrients on which algae feed. However, in some areas tap water can contain high levels of these nutrients, defeating the point.

How can I prevent this?

Have your tap water tested for nitrate and phosphate. If levels are high you should use different water for your partial water changes. Bottled still mineral water (not table water) is usually the best water to use but your local aquatic shop may be able to provide you with an alternative.

Regularly test the pH and hardness of your aquarium water. This will indicate if the water you are using is having an adverse effect on your aquarium in the long term.

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