Assertion: tetra's colour | /r/HasProperty | iridescent
Facets:
Source sentences:
text: It is perfectly natural for a Neon Tetra to look dull during the night since it turns off its iridescent colours.
text: A Neon Tetra that is kept alone instead of in a shoal can loose its iridescent colours, and the same is true for tetras that become stressed by the presence of bullying fish or that are kept in a barren aquarium without any good hiding spots.