I am very new to this hobby, but I can definitely highly recommend a refugium. We are using the "Ecosystem" model. Three chamber with inflow into bioballs; middle containing mud, calarpia, liverock, and some cleanup crew; filtering through additional bio balls into another chamber and pumped out.
We do not have a skimmer, but will watch carefully as it comes highly recommended. However, there is an "ecosystem" web page that claims one is not necessary with this set up. I have not read much to confirm other that talking with someone who uses the system and the website. Take it for what that is worth from a beginner!