Had 2 on my 55 <36x18x21> thought there was lots of flow till I bought a mp40 to hold while replacing a dunked control. mp40 is a little strong for the some of my corals to be right in front of but an inch or 2 out of the stream is ok. mp10 left mp10 back mp 40 right. 10's at 100% 40 at 80ish. I switch between tidal swell and nutrient uptake once every while.
to bad the 10s wont fit on the next build 2 new 40s is going to add to the cost
happy with them other than that.