Provide a healthy and stress-less swimming spot for your fish with Dr. Tim’s Aquatic Koi Eco-Balance Aquarium Cleaner. This cleaner helps re-balance ponds and water gardens to create a healthy environment for your fishy friends. It adds friendly probiotic bacteria to naturally reduce the amount of bad bacteria and algae growth in your pond’s water. This completely natural cleaner won’t harm pond plants and helps promote the well-being of your fin-tastic friends!