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Thnx for the honest reply Dick. I have a BS type filter as an addition to vortex's and nexus both. Having been only on for a few weeks, I can't say much about it as a stand alone filter, but since the addition two things have happened.
One: within a few days, the koi stopped gulping at the surface and "breaching". I think this behavior has much to do with gas supersaturation via diffuser drains ala Maurice's opinion which has been remedied by the degassing effect of the BS.
Two: I had ALOT of DOC's for this past few weeks. No other changes were made in this 4 year old pond other than the addition of the BS. It is getting better now, but wasnt sure what to make of that.
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Best regards,
Bob Winkler
My opinions are my best interpretation of my experiences. They are not set in stone as I intend to always be a student of life. And Koi.  |