Also, koi are extremely messy fish & shouldn't be kept in such a small tank. They really are pond fish. We had some large goldfish in a med. tank before & it required 100% water changes every few days or it was just full of fish poop. These fish willl overwhelm even good cannister filters, like an Eheim, IMO & IME. Your friend will probably need to upgrade both tank & filtration if he wants to keep those koi long-term. Nothing smaller than a 6' 110g and probably a couple of AC500s & a good cannister filter IMO.
Anthony
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04-20-2007, 06:47 PM
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