Ron Shimek:
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Very fine particulate organic material, mostly bacterioplankton or small phytoplankton, is filtered from the water and is caught on the mucous layer lining the branchial basket. Tunicates are awesomely effective suspension-feeders; even small ones can filter hundreds of liters of water per day and remove well over 95% of its bacteria.
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How much flow do you have in your tank Sasquatch ? Since bacterioplankton makes up a large part of their diet possibly using very small amount of vinegar when you dose kalk could increased your bacteria levels also.