Ha, yeah, I've seen that page myself. The difference is obvious, however, you'll note that he didn't drill any extra holes into the upper reservoir and may be using the stock airpump. I don't see how an added airstone could possibly hurt, I just question if you really need one given the other additions. Either way, I'm excited to see your results and will likely try out an airstone myself. Oh, and take a look at the journal I just started. Very similar to your own grow. Def thinking we can learn from each other as we go along.