Hello, fellow aquaponic practitioners! I’m Joel, a grad student of horticulture at UW, and I’d like the opportunity to visit your system if you use flood-and-drain (or ebb and flow) grow beds within a day’s drive of Seattle. I recently built a conceptual model of O2 concentration in the root zone of these systems and I would like data for calibration. So I would visit you in April, check out your…