probiotic bacteria absorb during their multiplying process organic carbon, nitrates and phosphates. They constitute food for corals and their excess is removed by the skimmer. They create bacterial fauna most similar to the natural fauna and also reduce the growth of pathogenic organisms in aquarium. Required dosage: 1 drop per every 100 litres of water. In case of smaller aquariums the above dose can be applied every 2-3 days.