Adding air now will help you get used to it, understand it, and get it set up right where you want...before you need it. It has taken me almost 3 years to get a good grip on what my aeration system does to my pond. So, getting it going now will, not only be exciting, but allow you to experiment before it is actually critical.
Forgive me for not reading back through the thread entirely, but....
Did you ever estimate how many gallons it contains?
What type and brand of diffusers are you looking at buying?
I will assume that you will only be aerating at night during the summer months which means the system has to do its job in much less time. This means a larger system than a generic sales chart will suggest.
We will also need to know what depths you plan to put the diffusers in and how many. I suspect 1 or 2 diffusers will be enough....your thoughts and desires? The more diffusers, the better the surface conditions (if needed) and the bigger the pump will need to be.
