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From The Aquarium Wiki

Anostomidae, or Headstanders, are a group of fish belonging to the order of Characiformes. They usually have elongated bodies and small, apical to upturned mouths. Headstanders may orient themselves from 45 up to 90 degrees at times. This family contains twelve genera and at least 137 species.

	Common name	Difficulty	Maximum Size	Minimum Tank Size
Abramites eques	Eques Headstander	Moderate	66 in15.24 cm	5555 gal208.198 liters 208,197.648 mL
Abramites hypselonotus	High-Backed Headstander Marbled Headstander	Moderate	66 in15.24 cm	3030 gal113.562 liters 113,562.353 mL
Anostomus anostomus	Striped Headstander	Moderate	6.29921259842526.299 in16 cm	4545 gal170.344 liters 170,343.53 mL
Anostomus ternetzi	Ternetzi Anostomus Ternetz's Anostomus	Moderate	4.72440944881894.724 in12 cm	3535 gal132.489 liters 132,489.412 mL
Laemolyta taeniata	Banded Headstander Striped Headstander	Moderate	1010 in25.4 cm	5555 gal208.198 liters 208,197.648 mL
Leporinus fasciatus	Black Banded Leporinus Banded Leporinus	Moderate	1212 in30.48 cm	7575 gal283.906 liters 283,905.884 mL
Pseudanos trimaculatus	Three-Spot Headstander	Moderate	55 in12.7 cm	2525 gal94.635 liters 94,635.295 mL