Question: What magazine is dedicated to freshwater and saltwater fishkeeping and the aquarium/fishkeeping hobby in general, The Progressive or Aquarium Fish International?
Context: Aquarium fish feed is plant or animal material intended for consumption by pet fish kept in aquariums or ponds.  Fish foods normally contain macro nutrients, trace elements and vitamins necessary to keep captive fish in good health.  Approximately 80% of fishkeeping hobbyists feed their fish exclusively prepared foods that most commonly are produced in flake, pellet or tablet form.  Pelleted forms, some of which sink rapidly, are often used for larger fish or bottom feeding species such as loaches or catfish.  Some fish foods also contain additives such as sex hormones or beta carotene to artificially enhance the color of ornamental fish. The Progressive is an American monthly magazine of politics, culture and progressivism with a pronounced liberal perspective.  Founded in 1909 by Senator Robert "Fighting Bob" La Follette, it was originally called La Follette's Weekly and then simply La Follette's.  In 1929, it was recapitalized and had its name changed to "The Progressive"; for a period "The Progressive" was co-owned by the La Follette family and William Evjue's newspaper "The Capital Times".  Its headquarters is in Madison, Wisconsin. An aquarium heater is a device used in the fishkeeping hobby to warm the temperature of water in aquariums. Most tropical freshwater and marine aquariums are maintained at temperatures that range from 22-30 °C (71-86 °F).  The types include glass immersion heaters and undergravel heating.  There are also heating mats that may be placed under the aquarium. Aquarium fish clubs or aquarium societies are social rather than academic associations for fishkeepers.  They are to be found around the world.  Some clubs include members in all the different aspects of the hobby, while others concentrate on one particularly field, such as cichlids or marine fishkeeping.  The first aquarium society ever formed was the "Gotha Aquarium" in Germany, founded in 1882.  The oldest continuous aquarium club still in existence is the Boston Aquarium Society, founded in 1916.  A Brooklyn Aquarium Society in New York City founded in 1911, but disbanded mid-century, and later reformed in the 1950s with the same name. Practical Fishkeeping (also known as PFK) is a United Kingdom-based aquarium magazine.  It is published every four weeks by Bauer.  The title covers the entire aquatic market from tropical freshwater and tropical marine fishkeeping throughout the year to small amounts of pond and coldwater fish coverage during the summer months. A brackish-water aquarium is an aquarium where the water is brackish (semi-salty).  The range of "saltiness" varies greatly, from near freshwater to near marine and is often referred to as specific gravity (SG) or salinity.  Brackish water aquaria is a popular specialization within the fishkeeping hobby.  Many species of fish traded as freshwater species are actually true brackish species, for example mollies, Florida flagfish, and some cichlids such as chromides and black-chin tilapia.  There are also several popular species traded purely as brackish water fish, including monos spp, scats, archerfish, and various species of pufferfish, goby, flatfish, and gar.  Generally, aquarists need to maintain a specific gravity of around 1.005 to 1.010 depending on the species being kept, but practically all brackish water fish tolerate variations in salinity well, and some aquarists maintain that regularly fluctuating the salinity in the aquarium actually keeps the fish healthy and free of parasites. Trichogaster fasciata, the banded gourami, is a tropical labyrinth fish native to Bangladesh, Eastern India, Nepal, Upper Myanmar,China and Pakistan.  It is benthopelagic and prefers weedy environments such as estuaries, ponds, large rivers, ditches, lakes and rice fields.  Size of a fully grown male can be up to 12 cm .  Females are usually a little smaller.  In the fishkeeping hobby, the banded gourami is appreciated for its distinctive color bands and peaceful nature.  It is somewhat shy but quite hardy, and easily adapts to life in community aquarium.  It is also easy to breed in captivity.  Additionally, the fish is used for food in its natural habitat.  Due to having both ornamental and food value, the species may be overexploited, but it is currently widespread. Neolamprologus brichardi is a species of cichlid endemic to the alkaline waters of Lake Tanganyika in East Africa.  It is a popular aquarium fish kept in the fishkeeping hobby, where it is known under a variety of common names including Princess cichlid, Princess of Burundi, Lyretail cichlid, Fairy cichlid and Brichard's lamprologus.  In addition, the species is also the subject of numerous studies on fish behaviour.  It is closely related to "N. pulcher" from the southern half of Lake Tanganyika ("N. brichardi" is more widespread) and some have recommended merging the two into a single species. "Aquarium Fish International" (AFI) was a North American monthly magazine, published by BowTie Inc. of Irvine, California, and dedicated to freshwater and saltwater fishkeeping and the aquarium/fishkeeping hobby in general. William Thornton Innes III, L.H.D. (February 2, 1874 – February 27, 1969) was an American aquarist, author, photographer, printer and publisher.  Innes was the author of numerous influential books and hundreds of articles about aquarium fish, aquatic plants and aquarium maintenance during the formative years of the aquarium hobby in America.  Born in Philadelphia, he was the founder, publisher and editor of "The Aquarium", the first successful national magazine on the subject of keeping freshwater tropical fishes.  The magazine ran monthly for thirty-five years from May 1932 through January 1967.
Answer: Aquarium Fish International