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#1
04-20-2007, 06:47 PM
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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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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it! 
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#2
04-20-2007, 07:05 PM
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I think over 100g will not enough one day.. .. I got 2 18" Koi.. Migrate fish from tank to a huge water tub that around 6' x 6' x 4' in the furnace room.
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#3
04-21-2007, 12:53 AM
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Thanks for the advice everyone!
You all are saying about the same as what I was thinking too. I know the tank is not large enough for these fish. So I will recommend he get a 100+ gallons tank. In the mean time I will help with doing water changes and check the filter media. Thank you!
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#4
04-22-2007, 12:25 AM
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make sure you do the water change slowly as the Koi currently used to the dirty water... so a quick change from dirty to clean water migth causing problem
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