Tiger Barb

[DjLeethul]

Does anyone know what causes this? It is not a green tiger barb

 

[raptorrex]

Does anyone know what causes this? It is not a green tiger barb

its actually the same thing that makes the green ones green, or indeed the sky blue. cant remember the name for it, but its basically the partials in the fishes slime coat, reflecting and absorbing the the different colours of the spectrum.