Penn-Plax Pro-Z Zeolite Crystals Fish Filter Accessory, Medium, 44-oz Bottle

The Penn-Plax Pro-Z Zeolite Crystals Fish Filter Accessory helps to keep your freshwater aquarium clear. It contains zeolite, which is proven to remove ammonia, helping to keep your finned friends and other aquatic pals healthy. It’s fast-acting and long-lasting, and maximizes the efficiency of your filter (sold separately). It’s particularly fin-tastic for goldfish and koi. This is also great for use with aquatic turtles and aquatic amphibians.