Fluval Zeo-Carb 1200gis a premium blend of Fluval Carbon and Fluval Ammonia Remover.Working together, these highly effective media eliminate liquefied impurities, odours, and discoloration, while, at the same time, removing toxic ammonia, for a clean, healthy aquarium. Combining two products into one gives you more space in your filter system for other types of media. Replace once a month, more often if aquarium is heavily populated.Remove when medication is being administered in aquarium water. Use carefully when keeping live plants. For freshwater use only. Premium select media for use in Fluval Canister Filters, ideal for all filters. Suggested Media Placement105, 205, 305, 405: Mid, or Lower Level Media Baskets FX5: Top or Middle Media Baskets