No I haven't fertilized the yard yet. If I do which I may have to to get the grass to grow, I am going to use organic with little or no phosphorus (sp?). The diffusers are located in the center of both ends. The pond is kinda peanut shaped so Stoney Creek suggested the two diffuser setup. My kids aren't to glad about my choice of locations for the diffusers since it tends to collect the stuff right in front of the swim platform. The diffusers have a two foot by two foot underlayment beneath them. I haven't put any bacteria in it since it was a brand new pond. Should I? The only thought I have had about the film is that when the pond was dug, last November, the material that was taken out was peat and marl. The marl obvioiusly is very light when dried out and since I have been almost contiuously watering the new grass, I thought it may be Marl particles that are being carried into the pond from watering and floating. Then algae is attaching itself to it thus giving the inital white color to the film and then the green after a few days.

Its not how well you do something,
Its how well you look doing it!