Looking into getting affordable controllable power heads for my 29gal reef tank. I was planning on getting 2 of these. I also have a return with flare nozzle at about 300gph close to the surface (creates small ripples) So I have a couple questions. 1. I was gonna put 1 a couple inches under the return faces the other wall and then the other on the other wall off center. Would this be good placement? And 2. Would I be better off with 2 SLW-20s or 10s. I was gonna get 2 10s but I’m reading the flow on them is different and doesn’t over power a tank like some other power heads do. I am planning on having a mixed reef. Here’s a pic of my setup as of now just for visual