Can you mix large koi and small koi? Can you mix koi and goldfish?

 Yes and Yes.  Koi and goldfish are both types of carp, they will live side by side in perfect harmony.  Also, large koi will not eat or harm smaller koi.  Larger koi will eat koi eggs after a spawn and perhaps the tiny koi fry after they are hatched.  But a 24" koi will not eat a 4" koi.  The only concern with mixing large koi and small koi or goldfish is that the larger koi tend to get all the food and smaller fish don't get the nutrients they need to grow.  So the small koi can stay small if you don't take care to make sure they are also getting food.  Sometimes just switching to a smaller pellet is enough.  Large koi can eat a small pellet without issue.    

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