Great news 2trackin! I couldn't really believe this hadn't been tried. In my setting I have a spring-fed waterfall dumping 300-2000+ gpm. I think this will really help with DO and creating a cool flow area for the trout. I wouldn't be surpassed or unhappy if the koi seek out other warmer parts of the pond.
2trackin-- do your koi successfully reproduce to maturity or do the trout and other fish eat off the young?
