We are currently running an experiment on specific nutrient uptake of lettuce grown in hydroponic, and both one and two loop aquaponic nutrient solutions. To guarantee that all relevant data is available after the experiment, proper data logging is an often underestimated factor. The excel logging file can be used and adapted by everyone for personal usage. You can find the aquaponics logbook in our new section “Tools”. The tool can log pH, light, air temperature, air humidity, water temperature, volume, EC, N-NO3, N-NO2, TAN, P-PO4, K, S-SO4, Ca, Mg, Cl, Fe, Mn, Cu, Zn, B, Mo and converts ppm (mg/L) to mmol/L automatically.  It also allows you to log how much acid/bicarbonates you added to your system for pH adjustment purposes.