Internal Aquarium Filter Basics
Internal Aquarium Filters are ideal for use in aquariums where other filters are not easily used, such as in turtle or terrarium tanks. Internal filters can either be electric power or air driven, and in most cases provide mechanical, chemical, and limited biological filtration ability. Internal filters are completely submersible, and can also be used in situations where a little more filtration or circulation is in need. Air driven models are best used in small aquariums up to 30 gallons; power models are available for aquariums up to 80 gallons.