Hikari RIO+ Ammonia Minus Pad (Orange) is a specialized chemical and mechanical filtration media specifically formulated to reduce ammonia levels in marine, reef, and freshwater aquariums. Designed to trap particulate waste while actively removing excess ammonia from the water column, it helps create the conditions required for improved water quality, reduced fish stress, and overall aquarium system stability. By removing ammonia before it can become toxic to aquarium inhabitants, it helps support balanced aquarium ecosystems and long-term aquatic health. Easy to cut, install, and replace, and precisely manufactured for consistent results, Hikari® RIO+ Ammonia Minus Pad (Orange) helps maintain a stable aquatic environment where fish, corals, and other aquarium inhabitants can thrive.