I use ReefCrest at 100% w/my second pump operating in anti-sync mode. I also used the nightmode for a while but then figured it wasn't really needed for my system. With two pumps in anti-sync, the combo produces the equivalent of 50% output for the two but incorporates randomness. Nightmode reduces the combi flow to 50%, but without any randomness. I don't see the point in removing the randomness at night.