Flagtail Characin that was in the Aquarium tank (under the sloths) in Spirit of the Jaguar (Thanks to Kakapo for identifying)
(African) longfin tetra; (African) long-finned tetra; African longfin. Butterfly House (dwarf crocodile exhibit).
African red-eye tetra; African red-eyed characin; Niger tetra. Butterfly House (dwarf crocodile exhibit).
Congo tetra. Butterfly House (dwarf crocodile exhibit).
Also known as: Norman's headstander, Marbled headstander. Aquarium (Amazon exhibit).
In photograph: Festivum (Mesonauta mirificus); Norman's headstander (Abramites hypselonotus).
Separate names with a comma.