[2] Adult fish reach a maximum length of approximately 9 centimetres (3.5 inches).

[2] Breeding pairs of the species most often lay their eggs over the bottom, but occasionally also among the roots of free-floating aquatic plants.

Pairs stay close for some time, with just a few eggs being produced each day.

[2] Nonetheless, the species has been maintained in aquaria since 1905 as documented by Arnold, Meinken and Ahl, who described F. fallax in 1939, decades after its first commercial importation.

Additionally, the species can be found in several color morphs in the Terra Typica - in the care of F. kribianum: orange, blue and yellow.