Eco-Balance - friendly probiotic bacteria for a balanced aquarium environment and core system health. Research has demonstrated that friendly probiotic bacteria are key to maintaining a balanced, stress-free aquarium environment. The normal processes in a pond upset this balance and allow unfriendly bacteria and algae to dominate. This can negatively affect water quality and overall fish health. Eco-Balance uses friendly probiotic bacteria as a natural way to restore and maintain a balanced pond environment while enhancing the immune response of fish. With specific probiotics against several species of bad bacteria Eco-Balance reduces the numbers of bad bacteria in your pond resulting in a clean, healthy, less-stressful environment. For koi ponds.