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are guppies aggressive with other fish

are guppies aggressive with other fish
Bettas may have first entered the USA in 1910, via importers in California; there is also facts they were imported in 1927 from Cambodia. While it is doubtful when bettas became familiar in the aquarium trade, the early 20th century marked the 1st known departure from centuries of breeding bettas for aggression, to as a substitute choosing for colour, finnage, and common beauty for decorative purposes. In 1927, a piece of writing was published in Germany describing the long, flowing fins of the “veiltail” breed, which suggests an emphasis on aesthetic beauty. In the 1950s, an American breeder created a larger and longer finned veiltail, while around 1960, Indian breeders discovered a genetic mutation that allowed for two caudal fins, generating the “doubletail” diversity. Within that decade, a German breeder created the “deltatail” characterized by its broader, triangular fins. Bettas are also littered with the pH of the water: a neutral pH of 7.