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Hi bro, since you have done weekly water change, skimmer may not be required. Reference: http://www.nano-reef.com/articles/?article=3 Protein skimmers are beneficial however, because they remove excess nutrients from the water, but this advantage is out weighed by the disadvantages. To remove the excess nutrients from this system you do a partial water change. The water change also doubles to replenish your trace elements, which are in your synthetic sea salt. Nitrates are removed, dissolved organic compounds are removed, and your trace elements are replaced. Your nitrates will always be at or near zero, and the elements will stay at a consistant level.