If the main idea of the fuge is to grow pods I would cut the flow considerably. I think that around 5X turnover is what is recommended. On a twenty gallons you have a maximum of 500 gallons flowing through it. I don't have the graph and do not know how high you are pumping the water, so I can't say what your true flow is, however, it would seem to not be the ideal conditions for pods. Having said that, you will likely still have some, just nowhere near as many with that high turnover.
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