I used to use the prefilter box on my remora when I had it on my 45. The prefilter box was good if you needed surface skimming as I did. One thing that I noticed was the need to top off the tank much more frequently (every day) vs my previous cycle of every few days. The reason is that as the water evaporated the water level would fall below the filter box inlet slits and thus no more water would flow into the skimmer intake.
Had I had an autotopoff on this tank it would not have been that big of a deal.
__________________ Remember dont tap the glass, your fish will think you're an idiot-Anonymous mother