Give your koi the perfect pond to play in with Dr. Tim’s Aquatics Koi One and Only Aquarium Cleaner. This cleaner helps eliminate new pond syndrome by setting up a biological filter in your new pond or water garden. It’s designed to safely remove toxic chemicals that could harm your fishy friends—including ammonia and nitrite. This completely natural cleaner is formulated so it cannot be overdosed and you can safely put your fish immediately back into their fin-tastic new abode after treatment. Welcome home， little buddies!