Eco-Balance Pro Biotic - Freshwater 250ml Eco-Balance uses friendly probiotic bacteria as a natural way to restore and maintain a balanced aquarium environment while enhancing the immune response of saltwater fish. With specific probiotics against several species of Vibrio, Eco ...Eco-Balance Pro Biotic - Freshwater 250ml Eco-Balance uses friendly probiotic bacteria as a natural way to restore and maintain a balanced aquarium environment while enhancing the immune response of saltwater fish. With specific probiotics against several species of Vibrio, Eco-Balance reduces the numbers of bad bacteria resulting in a clean, healthy less-stressful aquarium.Eco-Balance is an all around probiotic, like yogurt, and should be added once a month to re-balance the tank.