I would assume the lower the psi the better for the pump although if I am understanding correctly it would be ok for this pump to run at 10psi?
I am going to stick with the 2 diffusers running at this point and in the winter go down to 1 and relieve pressure by running a line directly into the water if needed. I should have no problem keeping it around 5-6psi doing this.
When I get in touch with Ted I will relay any info I get from him about this setup.
Any suggestions on a good air filter setup? I would like to upgrade from the seemingly cheap plastic/foam insert thing that came with it.