For SALT & FRESH WATER The bacteria are natural, non-pathogenic and will reduce the organic waste that fish release. Prevents "new tank syndrome" Helps to eliminate ammonia and nitrate Provides rapid reduction of organic waste Helps to clean power filters, ornaments and gravel Helps to reduce fish loss When adding new species to your aquarium always follow standard guidelines for the concentration of NH3 and NO2. The presence of ammonia and/or nitrates indicates tank over-crowding.