Thanks again guys, and I definately do like living in Minnesota. Feel much like you do, Catmandoo, about it. Thanks for the heads up on that Picasa. I'll check it out.
Dave, I've two diaphram pumps that pump into 3 diffusers. Total is just over 5CFM.
The reason I have two is: The first(bigger) pump I put in my pole barn and ran air line to the pond. I tried to run it last winter but had troubles with the airline freezing up.
Rather than mess with changing it, and since I wanted one of the diffusers in a shallower area, I bought a smaller 1.8cfm pump and put it at the base of the dock, with the diffuser just off the tip of the dock.
My thinking is, once the other one starts freezing again up I'll shut it off for the winter. The pump at the dock, with a short airline(and diffuser in 4.5ft water) I'll run all winter.
I also like the idea of having a backup incase either of the pumps crap the bed.
