Durban Poison - DWC

The first week in the pots wasn't so good, but I have certainly learned what my plants like and how to maintain my nutrient solution. Utilizing organics, I've noticed significant pH drift day to day. Another lesson is that marijuana plants do not need to live in a swamp. Too much watering during the week led to significant root rot in half my canopy. Thankfully, I had some backup seeds ready to go and got a couple to fill the tent. With less water and a balanced nutrient solution, the girls are now happily humming along. Day to day I am experimenting with light intensity, CO2, and ventilation rate to see the response. I am looking for an efficient way to begin logging the data so that future decisions can be made. Does anybody recommend a good software or excel sheet?