On my 75 I use a MP40 and a Hydor Evo 1400. What I noticed is that the MP40 side (right) has a lot of undertow and flow. But once you go beyond 2' past it, the flow is pretty low. I run it at 75%
I plan to replace the left Hydor with another MP40 once funds permit it. I keep SPS and LPS and Softies
Also, I dont know what brand of tank you use, but mine is a 75g aqueon drilled tank, and I called the manufacturer a few days ago and asked them the glass thickness and they told me all sides are 5/16