What color is king Betta fish most attractive to?

King Betta can relate to Crown tail Betta types with double double ray finnage or may mean a Giant Betta, these are both just breeder names in the hobby but aren't recognised professionally as true name types using the 'KING' variation.

Regardless of which type you mean, the majority of Bettas are individuals and will spawn with which ever female Bettas that hold their interest at the time.

They don't necessarily always like females with matching colouring and their preferences do come down to the Betta's personal choice.

Some will be more attracted to similar coloured females, some prefer opposing colours while others will happily spawn with which ever female they come in contact with.

Giant Betta males and females are quite sluggish on the breeding side of things and most breeders find it easier to spawn half giants or a Giant male to a normal female.