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From The Aquarium Wiki

Goodeidae, or Splitfins, belong to the order Cyprinodontiformes. They are livebearers with 19 genera and 40 species within the family.

	Common name	Difficulty	Maximum Size	Minimum Tank Size
Xenotoca eiseni	Red Tailed Goodeid Redtail Splitfin Orangetail Goody Redear Goodeid	Moderate	2.36220472440942.362 in6 cm	2525 gal94.635 liters 94,635.295 mL