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Many thanks for all your feedback.
I read that micro bubbles dissolve more readily into the water by virtue of their increased surface area, thereby raising the DO level in the water. Koi cannot utilize oxygen in a gaseous form; it must dissolve in the water to be useful to them.
I read somewhere, however, that if the tiny bubbles get stuck in the gills of the koi, it might get absorbed into the koi's body in a gaseous form and cause BENDS, very much similar to the harm that may befall a human being if a bubble of air gets into our bloodstream. This is what is getting me worried.
Micro bubble diffusers cost quite a bit, about the equivalent of USD150 per foot run. I would spend it if it is GOOD for my koi, but I must be assured they're not actually HARMFUL for them!
Any further thoughts?
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