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Definately a sump, Koi produce huge bioloads. You should also add a FBF to reduce ammonia/nitrites, but remember the water coming out of it lacks oxygen so you'll need to arerate it well before it goes back into the tank. Meanwhile, you could use emersed Spathiphyllum wallisii to help reduce nitrates.
 

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When you say "sump" you are talking about a wet/dry or trickle filter, correct? If so, I would agree with you. These filters oxygenate the water as well as function as large biofilters. Should work well with your koi and large tank.

Will you be keeping plants in this aquarium? If not, you may want to consider a plant filter in a section of the sump, depending on how large it is. Set it up on a reverse daylight schedule and drop in some floating, fast-growing plants such as Ceratophyllum.

Good luck and be sure to post pictures.
 
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