I am running one swivel steiner compliments of miwoodard, btw his craftsman on these are impecable!!! I have another waiting to go into the new tank plus the Tunze wavebox. Doing the plumbing tomorrow, so should have water spinning this week. I will update on that flow, 36x36x30. The black props are horrible. They make tons of noise and I couldn't figure out why. I was going to go to the black props and run both steiners, but it was so noisy that I wanted to rip my hair out. So, back to the white prop and things are as quiet as can be and only running one now. Works perfect. Those black props are a joke, they just **** the modded pumps off?