I run my skimmer all the time. I still don't understand how some run without one or just part time, especially with anything more than a light fish bio load. My same system, I used to use Caulerpa in the fuge with no skimmer and could not keep Nitrates lower than 40ppm. Now I use an Octopus NW 200 SKimmer and chaeto in the fuge and the nitrates are 0ppm all the time.
I don't know if this is due to a better macro algae and/or good skimmer. I do know that 24hrs of my skimmate/sludge is something I don't think should stay in the tank.