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Stronger and less stressed fish: supports skin and gill flora - reduces sensitivity to changes - ideal for recovery or transportation. Vivid colours and natural behaviour: beneficial bacteria improve energy and assimilation - ideal for bathtubs with varied wildlife. PERFECT FOR REPRODUCTION - Improves conditions for laying - helps fry and sensitive species in growth. ORGANIC & 100% SAFE - No metal, additives or reaction with other substances - ideal for shrimp, coral and exotic fish. Practical 473 ml bottle: 25 ml / 100 litres, then 15 ml/week - suitable for continuous use - can be combined with all cycles ARKA.