Small amounts of algae are natural and harmless, large amounts indicate that there is a water quality problem.

Algae problems are usually caused by a number of factors rather than just one.

Follow the prompts to find the cause or causes of your problem.

The aquarium is in a sunny position

The light unit is on for more than 7 hours a day

The fish are fed at least once a day

The aquarium is well stocked with fish

The last partial water change was more than 8 weeks ago

The filter cartridge has not been changed for at least 8 weeks

There is debris at the base of the aquarium

There are no live plants in the aquarium

Tap water is used for partial water changes

Anti-algae treatments

These questions cover the most common causes of algae problems, it is likely that there is more than one cause.

If you can’t find the answer here or need more help get in touch with us and we will do our best to find the answer with you.