Not to deter you from tracking your progress here, I've found aquaticlog.com useful too. It tracks your measurements, equipment, inhabitants, set up date, costs (I stopped tracking costs, it was too scary) and also gamify it in a way. I've fallen off on entering measurements and inhabitants but if you keep on top of it, it is helpful. I can figure out when I need to change filtration media, how long my tank has been up and running etc.
http://www.aquaticlog.com/aquariums/missjdub/2