What makes One & Only so effective is its formula based on live nitrifying bacteria , selected for their ability to quickly transform toxic waste (like ammonia) into harmless compounds. This process, called nitrification, creates an immediate biological balance , without having to wait weeks for the natural cycle to take effect. Whether for a nano-aquarium or a large reef tank, a few drops are enough for the entire ecosystem to stabilize effortlessly. It is a trusted solution to avoid ammonia spikes during the first critical weeks.
A safe solution for all types of aquariums
This treatment is completely natural , without preservatives, harsh chemicals and most importantly, no unpleasant odor. It is perfectly suited to all types of tanks, whether freshwater or saltwater . Its versatility makes it a wise choice for demanding aquarists who care about the well-being of their wildlife. One & Only also promotes healthy growth of corals, plants, invertebrates and fish , laying the foundations for a clean and stable environment. Whether you are setting up a new tank or have just completed a treatment, it helps to effectively recolonize the biological filter .
Easy to use and suitable for all situations
One & Only comes in 24 convenient 10ml ampoules , ideal for targeted treatments or regular feedings. It's super easy to use: just shake, open the ampoule, and pour onto the filter or directly into the water. Within minutes, the product will work to restore clear, healthy, and stable water . No more waiting for endless cycles: your aquarium can welcome its first inhabitants in optimal conditions. It's also a great option after a water change, adding fish, or following a medication treatment .
