I would go ahead and add the air now and not wait. You can get one at a big box store that is better than nothing. I am using the one below and have had good luck with it last year and still working this year. It is on 24/7. I also like the fact that I can add multiple stones to the tank, plus last year I had fry like crazy and was able to add air to the other tanks as well.

http://www.amazon.com/gp/product/B000BJP4V0/ref=oh_details_o09_s00_i00?ie=UTF8&psc=1