I am trying to design a giant phytoplankton culture out of a ten gallon tank to feed my lot of filter feeders --and save money--. I have two designs but can't think of which would be better. Both would be fed water from the drain on my tank, then --when large enough-- later be partially drained to my tank and refilled with the dirty water. Also, tank A would have an airline tied to the pump so that air gets pumped into the tank still. Here is my two designs I am hoping on feedback for. I uploaded it and added a google drive link
https://drive.google.com/open?id=0B6IxlRFRRmJccndMSDNFM2s5UHM
https://drive.google.com/open?id=0B6IxlRFRRmJccndMSDNFM2s5UHM
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