Im going to start a journal of my first truly serious build. Im doing a 30 breeder. I started on the foam background but I also will be doing the false bottom cliff river and waterfall similar to Bill's 125g build. As soon as he logs on I can ask him about what is he using to color the foam that is going to be underwater... Will post pics soon. I plan on making the waterfall custom with a the pump and tubing running up the side of the tank as soon as I figure out what to use on the background so the water doesn't erode it.