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From The Aquarium Wiki

The Pupfish are a group of small Killifish belonging to 10 genera of the family Cyprinodontidae, the order of Cyprinodontiformes. There are about 133 species in this family.

	Common name	Difficulty	Maximum Size	Minimum Tank Size
Cubanichthys pengelleyi	Jamaican Killifish	Moderate	2.36220472440942.362 in6 cm	1515 gal56.781 liters 56,781.177 mL
Jordanella floridae	American Flagfish American Flag Fish Flagfish American-Flag Fish	Moderate	2.36220472440942.362 in6 cm	1212 gal45.425 liters 45,424.941 mL