So, I got a few more connections and brought my 1 Vertex diffuser in out of the water. Put a T connector on and my psi out of water, hooked straight to my compressor dropped to 1.5 psi.
Based on all the ratings I am seeing on these diffusers, one diffuser is rated at 2 cfm max and the pair together is rated for 4 cfm max.
Based on the specs of my compressor and the design of these diffusers, and through some testing, I am convinced I need to run the two diffusers together from one air line.
Now, I just need to make another run to the store to get another elbow so I can get everything set right and back in the water for a final test.
I am hoping I can run these two alone in deeper section of the pond and then run a single diffuser at about 3' in the winter. The two diffusers will be about 3" apart the way I was able to mount them.
Certainly getting closer to getting this setup running thanks to everyone's help here.
I'll continue to convey my findings in hopes that this has been beneficial to others besides myself.
