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You don't mention that you have an airpump in there? If not get a good one with a couple of airstones. Try to dertermine your turnover rate, 20 000l of water is a lot to filter once poluted. You should be turning over the whole pond at least once every two hours. Try to add something to boost your biofilters. Do small regular water changes. Have a scrape done and check for parasites that might invest the gills like gill flukes? AND add that salt ASAP.
There is really a lot that could be going wrong in a new temporary system like yours.
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