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From The Aquarium Wiki

Crenuchidae, or South American Darters, are a family of fresh water fish of the order Characiformes. There are twelve genera including about 74 species, though there are several undescribed species. There are also two sub-families which are Crenuchinae and Characidiinae.

	Common name	Difficulty	Maximum Size	Minimum Tank Size
Characidium rachovii	Rachow's Darter Tetra‎ Walking Tetra Hummingbird Tetra	Moderate	1.96850393700791.969 in5 cm	1515 gal56.781 liters 56,781.177 mL
Crenuchus spilurus	Sailfin Characin Sailfin Tetra	Moderate	2.36220472440942.362 in6 cm	2020 gal75.708 liters 75,708.236 mL
Poecilocharax weitzmani	Black Darter Tetra Black Morpho Tetra	Moderate	1.57480314960631.575 in4 cm	1515 gal56.781 liters 56,781.177 mL