I currently have a small skimmer that needs to be upgraded. My question is, should I get a larger skimmer or set up a refugium or do both? I have a 120gal reef tank with small bio load, the skimmer is biult into the wet/dry and is only 12"x3" ,venturi type. My goal is to help get rid of some brown algae and benefit the corals. I have the nitrates down to less than 5 ppm and phosphates to .2 ppm and still have problems with the algae. Any suggestions would be helpfull.