Tetra Algetten

Tetra Algetten* are an anti-algae treatment designed to combat algae growth in freshwater aquariums with up to 40 L. The product comes in the form of slow-release tablets that dissolve gradually, releasing the active ingredient that inhibits algae development for a period of about four weeks.

Yes, when used as directed, Tetra Algetten* are safe for both ornamental fish and aquatic plants. It has been specifically developed to avoid harming the biological balance of the aquarium.

Tetra Algetten* tablets are effective for approximately four weeks. For ongoing prevention, it is recommended to replace the tablets after this interval or as algae begin to reappear. Simply add one tablet per 10 L of aquarium water, position it in a place where there is plenty of water movement and repeat after four weeks if necessary. Avoid using activated carbon, UV filters, or performing water changes during treatment.

Tetra Algetten* is effective against common types of algae such as green algae and filamentous algae. For more persistent algae like black beard algae, other specialised treatments may be necessary.

No, Tetra Algetten* does not cause cloudiness or discolouration in the water when used properly. It dissolves slowly and works gradually, ensuring clear and healthy water conditions.

Tetra Algetten* and Tetra AlguMin* differ in application and action. Tetra Algetten* is a slow-release treatment that works over several weeks, ideal for long-term prevention and gradual algae control. Tetra AlguMin*, on the other hand, is a liquid solution for quick and intensive treatment, acting against acute algae problems. It is especially useful when algae growth is already severe.

Yes, Tetra Algetten* can be safely used alongside many other Tetra products, provided that the recommended dosages and application intervals are followed. It is compatible with Tetra water conditioners (such as Tetra AquaSafe or Tetra EasyBalance), plant fertilisers (like Tetra PlantaMin), and fish treatments – as long as they do not contain additional anti-algae agents. Always allow sufficient time between treatments and observe your aquarium inhabitants closely for any signs of sensitivity. Wait several days and check water parameters with the Tetra Test 7in1 before starting another treatment.

During treatment, maintain aeration (for example with a Tetra APS air pump), switch off UV clarifiers, avoid activated carbon filtration and refrain from water changes. Remove any dead algae mechanically to preserve water quality.

Limit lighting to 8–10 hours per day and avoid direct sunlight to stop algae from overgrowing. Don’t overfeed your fish – leftover food increases nitrate and phosphate levels, which algae love. To control nutrients, use Tetra EasyBalance weekly; it helps reduce excess phosphate and nitrate that promote algae growth.

Weekly water changes (20–30%) remove nutrients that feed algae. Between changes, Tetra EasyBalance keeps nitrate and phosphate low, preventing unwanted algae outbreaks.

Healthy live plants absorb nutrients and outcompete algae. Remove dying leaves and vacuum waste during water changes. A clean tank with strong plant growth is less likely to develop algae.

Remove algae manually, then check lighting and feeding. For treatment, use the Tetra anti-algae range. Maintain good aeration and remove dead algae to protect water quality.