API nexx Aquarium EXTENSION FilterThe API nexx Aquarium EXTENSION Filter is designed to go with the API nexx Aquarium FILTER. The modular extensions allow hobbyists to add onto their API nexx Aquarium FILTER (sold separately) as their needs change. The API nexx Aquarium EXTENSION Filter provides ultimate convenience, no mess, quick changes and filtration options that give you the flexibility you need and want. The API nexx Aquarium EXTENSION Filter allows you to add an additional 55 gallon filtration capacity to your already exisiting API nexx Aquarium FILTER.
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