I had my left one on the back wall, I could only go up to 20%. So they are now both on the sides running random mode at 80-90%. Can't go 100% until I update the firmware and see if the controller still shuts down. In random mode they don't run at the highest setting all the time and it's worked out well. @Berlibee is running 2 pumps in random mode so I figured I'd try it out!