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Old 27-09-2011, 10:37 AM   #10
swlk
Arofanatic
 
Join Date: Sep 2011
Posts: 65
Default Hmm...

Definitely. Unless you have some other method of oxygenating the water constantly. If there is not enough oxygen in the water the Koi will come to the surface to grasp for air which is no good for them.
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