Pineapple Swordtail - Xiphophorus helleri
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Swordtails, like other livebearers, make excellent options for beginner aquarists. When fully grown, they reach sizes up to 3", but are very peaceful and calm swimmers, allowing them to be kept in tanks as small as 10 gallons. They're very easy to breed in captivity, with the male being differentiated by his slimmer proportions, long 'swordlike' extension at the bottom of the tailfin, and the anal fin modified into a tubular gonopodium used in mating. It's recommended to keep them in groups with 2-3 females per male to reduce breeding stress.
Swordtails are omnivores, and will happily accept prepared foods as well as frozen and live offerings.