Bio-Spezial 500ml – a product for treating blue-green algae
Femanga Bio-Spezial is a 500 ml water conditioner for treating cyanobacteria and algae in freshwater…
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Find a productProduct description
Bio-Spezial is a water treatment product for aquarium keepers dealing with cyanobacteria (blue-green algae) and algae outbreaks. It is dosed by water volume and is meant to be used as a structured weekly course rather than a one-time addition.
Why it matters
- The manufacturer states that the mineral content supports fish condition and improves plant growth, which is the basis for displacing algae.
- Stronger plant growth competes with algae for nutrients, and the manufacturer states that this stops further algae development.
- The label gives a clear treatment schedule: 10 ml per 100 litres once a week until cyanobacteria and algae are gone, followed by a maintenance dose of half that amount.
- The manufacturer recommends a 6–8 week course and a darkened tank for the first 5 days of treatment.
Specifications
- Brand: Femanga
- Product name: Bio-Spezial 500 ml
- Package size: 500 ml
- Weight: 0.5 kg
- Treatment dose: 10 ml per 100 litres of water, once a week
- Maintenance dose: 5 ml per 100 litres of water, once a week
- Recommended course length: 6–8 weeks
- Recommended water change during treatment: 1/3 of the volume; up to 50% if shrimp are present
- Symbol: FEMANGA BIO-SPEZIAL 500ML
- EAN: 4260280830162
What it works with
The product is listed in the freshwater treatment category for aquariums with fish and plants that have algae or cyanobacteria problems. Dosing is calculated from the water volume of the tank, so the exact amount depends on tank size. Because the manufacturer warns that toxins released during cyanobacteria decay can harm shrimp, shrimp tanks need larger water changes during treatment.
Technical specification
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Frequently asked questions
Add 10 ml for every 100 litres of aquarium water once a week, until the algae and cyanobacteria are gone. The product works by starving algae of nutrients, which stops their further growth.
The recommended course lasts 6 to 8 weeks. Continue the weekly dosing for that period.
Yes, the manufacturer recommends replacing one third of the aquarium water during the treatment. This helps keep the water in good condition while the product is used.
Yes, the manufacturer recommends darkening the tank for the first 5 days of treatment.
Not without precautions. As cyanobacteria decompose, toxins can build up in the tank and harm shrimp, so the manufacturer recommends a water change of up to 50%.
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