Well Al I have a 135 freash tank and on that tank I have 1 AC 500, 1 Magnum 350, and 1 eheim canister. it is a little over kill for filtration but it just means I can clean one filter at a time and not have to worry about the bio filter. How may Koi will he be putting in the tank? I would give them a gravel bottom as they like to play with the rocks. Koi are a messy fish so he will have to keep up with the water changes
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1-135 gal Freshwater planted tank
1-120 gal Reef **For Sale**
It's just my opinon, I have lots of them.
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