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    Thread: Help. koi has odd (to me) disease around its eyes,euthanasia?.see photos need help

    1. #21
      RichToyBox's Avatar
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      The pH will fluctuate due to photosynthesis by the algae. During daylight hours, photosynthesis consumes carbon dioxide and releases oxygen. At night the process reverses. Carbon dioxide in water forms carbonic acid, which lowers the pH. With the reduction during the daylight hours of the carbon dioxide the pH increases and at night the process reverses. Even with large amount of baking soda, you will find slight changes from morning to evening, but they should be minor, which will help the fish and help the filter bacteria. The filter bacteria also produce carbon dioxide which for the first layers of bacteria is consumed readily by the KH, but as the depth into the filter media goes, the amount of KH available for consuming the acids is reduced and at low KH levels, can suffer from the low pH, killing the bacteria in those layers.

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    2. #22
      Ralphw62 is offline Junior Member
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      [QUOTE=RichToyBox;2771235]The pH will fluctuate due to photosynthesis by the algae. During daylight hours, photosynthesis consumes carbon dioxide and releases oxygen. At night the process reverses. Carbon dioxide in water forms carbonic acid, which lowers the pH. With the reduction during the daylight hours of the carbon dioxide the pH increases and at night the process reverses. Even with large amount of baking soda, you will find slight changes from morning to evening, but they should be minor, which will help the fish and help the filter bacteria. The filter bacteria also produce carbon dioxide which for the first layers of bacteria is consumed readily by the KH, but as the depth into the filter media goes, the amount of KH available for consuming the acids is reduced and at low KH levels, can suffer from the low pH, killing the bacteria in those layers.[/Q




      Pretty sure everything is now stable. its hard toi get at the bubbler hole in the middle of pond, but last tests had me at 8 drops kh and ph a steady 7.9-8

      just curious about photosynthesis at 36 degrees under ice?. havent seen any fish last few days after all the snow we have been getting.
      they seem to stay in one spot and its way under the ice cover. lots of air though.

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