I have an older/unknown skimmer working on my 125 gal reef/fish tank. I have to empty it (good stuff) once or twice a week. It seems to become less effiecnt as it fills up. AND I HAVE A PERSISTANT PROBLEM WITH HAIR ALGAE. Good water flow. Refugium soaking up nitrates and phosphates. Pulled back on the amount I feed. Reduced the lighting cycle. Still the hair algae persists. Might it be that my skimmer isn't strong enough? I've read where two skimmers are better than one. What do you think?