different types of Koi chart
koi fish by Terry Gilecki
this isn't a tattoo but it has a similar theme to my idea. A beautiful sketch like this would be stunning.
Under Tropic Skies by Terry Gilecki
butterfly Ginrin Yamabuki (koi)
This unique blue koi can be found in the pond below Maruoka Castle in Japan.
My Koi Pond
Siamese Fighting Fish, or a pair of Betta Fish (mating, I would assume, since it's never recommended to house more than one Betta per tank unless you know what you're doing).
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Maruten Kohaku Isa
Beautyful Japanese Koi