Legend Avernus AlBlackEX


Legend Avernus AlBlackEX™ was specially designed for the control of Black Beard Algae (BBA) in planted aquariums. This type of algae is not only unsightly, but fast-growing, and will quickly spoil the natural beauty of your fish tank. In order to help reduce stress within your aquarium, we recommend maintaining a healthy environment by providing nutrients such as those found in our Legend Essential™, Legend Heaven™, Legend Ancestral Phi™ & Legend Entity for fast recovery. As the plants grow, they naturally will strip the key nutrients required by BBA helping to slow growth rates.

Legend Avernus AlBlackEX™ is a highly effective means of removing BBA when combined with healthy water conditions and algae-eating inhabitants.

Legend Avernus AlBlackEX™ has been manufactured with only superior-grade raw ingredients.

We generally recommend a water change of 25% to 50% per week in aquariums. After the treatment against algae, use Ancestral Phi™ to reduce stress, to encourage rapid growth and the plant’s recovery


Sizes: 100 mL, 250 mL, 500 mL, 1 L, 5 L



acid ascorbic

epoxy aldehyde

synthetic phytohormones


Shake well before using.

Use a pipette to spot-dose on the affected area, for best results, drain the tank, and drip dose on the affected area. Wait a few minutes before refilling the tank

Use 1 mL for every 40 L on the affected area

Do Not Overdose.


             6 Tips for Avoiding Aquarium Algae Overgrowth

  1. Reduce Light Intensity and Duration

Placing your planted tank in a position where it will be in direct sunlight, even for a small part of the day, will promote algae growth.


Artificial light needs to be monitored to ensure that it is only as strong as is necessary and not on for any longer than eight hours a day. Consider using a timer on the plug socket to make sure you are keeping lighting levels perfect.


  1. Reduce Feed Amount

It is very easy to overfeed your fish and this increases water phosphate levels. Ensure you are removing any uneaten food from the aquarium after five minutes. If you are removing food after every feed, you are overfeeding.


  1. Increase Water Changes

If there is one thing that is important to do properly, it is regular water changes. The recommended amount to change is 25% to 50% of the aquarium water weekly. This will make sure that nutrient levels in the water are kept to an optimum level.


  1. Increase Water Testing

It is really important that you understand the water that you are putting into your planted tank. Test the water at the source for phosphates and nitrates, and then respond accordingly.


  1. Increase Overall Aquarium Cleaning

The minute you see algae (or even a potential algae site!) get cleaning started. Any movable items within the aquarium, remove them and scrub them hard. Glass can be scraped and gravel can be vacuumed.


     6. Increase Numbers of Algae Eating Fish

The fun way to keep your algae under control! Several types of tropical fish will help you by eating and grinding some of the algae in the tank. Plecostomus, Otocinclus and the Siamese Flying Fox are great examples.


Legend Avernus AlBlackEX SDS 20230622.pdf


Shrimp friendly
Storage: at room temperature. Protect from frost and heat. Keep out of reach of children and pets.
Use: Only for fertilizing ornamental plants in an aquarium.
See package insert for detailed dosage recommendations. Note: official guidance recommendations take precedence.
Shake well before using.

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Removes Black beard algae (BBA)

Effective means

Simple application

Optimal treatment for Black beard algae (BBA)

Biodegrades after 24hr

Safe for plants and fishes without long term side effects