The colour of a koi tattoo may have personal meaning to the person getting it, or a generalised colour meaning could be used, as in red for passion or love, blue for calm etc. But there is no standardised meaning to the colour of a koi fish tattoo.
If it is true that all carp are fish (yes, they are, so A=B) AND if it is true that all koi are carp (yes, they are, so C=A) THEN Are all koi are fish (C=B)? If A=B and C=A, does C=B? Yes, C=B meaning all koi are fish. Your argument is solid, valid, sound, and correct. they are bad
Two koi fish symbolize yin and yang according to feng shui.Yin and yang complement each other. This creates balance, harmony and happiness. Thus two koi symbolize harmony, balance and happiness, a symbol of good luck for marriage.
Koi is a Japanese word for a Japanese fish. Coy has a similar meaning to cunning. The words are not interchangeable even though they have the same pronunciation (they are homophones). Answer Koi is Japanese for carp, so it's a tautology to say "koi carp".