The sucking technique described should work or you can even use an irrigation pipe and drain it out with gravitation. The ideal would be a pond vacuum. If you are desperate, you can use mine.
Treat the QT facility with either Malachite green or Acriflvine to prevent fungus developing.
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Paul Viljoen
E Mail: koi@absamail.co.za ; http://www.koionline.co.za
Koi are not my whole life but make my life whole