Tropical Nitri-Active Biological Aquarium Starter

Tropical Nitri-Active is a biological water treatment containing live nitrifying and denitrifying bacteria, designed to establish and maintain a stable nitrogen cycle in freshwater aquariums. Whether you are setting up a new tank or restoring balance in an established one, it gives the filtration system a direct bacterial boost where it matters most.

What It Does

• Introduces beneficial nitrifying bacteria to kick-start biological filtration
• Accelerates aquarium maturation, reducing the wait before fish can be safely introduced
• Lowers toxic ammonia and nitrite concentrations during cycling
• Replenishes bacterial colonies after filter cleaning, substrate work, or antibiotic treatments
• Supports natural self-cleaning processes with regular use

The Bacterial Formula

The formula uses 100% natural, selected strains of both aerobic bacteria and facultative anaerobes. This combination means the biological processes function correctly whether oxygen levels are high or low — delivering a balanced ecosystem across different filtration setups and conditions.

New Tanks and Established Systems

Nitri-Active is suitable for use during initial setup to shorten the maturation period, and equally useful in mature aquariums that have had their biological balance disrupted. After filter maintenance or a course of medication, bacterial populations can crash — a dose restores that balance without waiting weeks for natural replenishment.

Choosing Your Size

Tropical Nitri-Active is available in two sizes to suit tanks of different volumes. Select the appropriate option from the variants above to match your aquarium's requirements.