Will a Protein Skimmer reduce Nitrate Levels?

[Keith khoo]

so no problem if you clean once a month?

mine 3-4 days already very black/brown, is it normal?

[Gouldian]

so no problem if you clean once a month?

mine 3-4 days already very black/brown, is it normal?

3-4 days is good.

I personally don't think cleaning once a month is good as I find that the build-up around the inner surface of the skimmer cup prevent effective skimming. That's why I don't connect my skimmer cup drains so that I will be force to service my skimmer cup twice a week.