What pump sequence did you see on the night mode? From what I can see, all pumps are on most of the time, with little switching, and I was wondering if this was normal--it's very turbulant.
i have a tsunami but the night mode is suppose to shut down all but one pump making a very quiet calm flow. maybe yours is defective, i would contact the store you bought it from.
A wavemaker's night mode should disengage most of the pumps and create more serene environment. I agree with fungia ... i would discuss this with the vendor you purchased from and see if you can get it replaced. I highly doubt the Red Sea wavemaker is supposed to be more turbulent at night.
I spoke with Red Sea and the pumps run at a lower voltage so they opperate at a lower speed/flow verse shuting down most of the pumps. I'll have to take a closer look now.