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Air can be anywhere in the pond, in the filter and so on ...
Air in the BD dome has several advantage other than aeriate the water. (a) sweeping current to assist waste to drain, (b) push slime to the pond's edge. There, with the spinning current, the skimmer'action is much more effective.
My pond has air domes and no such koi behavior observed. Maybe your koi think the dome is their campfire? stevec
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