So my son has a koi pond (150 gallons) that houses two bream, a bass and some mosquito fish. You guys know of any way to clear up the algae without killing the fish? Outside of pumping most of the water out and filling it back up. He's got two young lilypad plants in there but they're not big enough to help out yet. It's got a pump that feeds a small waterfall but it's not a filter per say.
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