I think the issues is that I have more inflow than outflow. When testing again without any media in the tank, I had a good siphon, but the siphon would not out pace the infill and reaches a steady state at half way. You will notice that my cap pipe is much taller than my stand pipe. I did not have time to shorten it tonight. Perhaps that may be working against me as well. Here are the requested pictures. I tore it apart but just stuck it back together for the pictures.