Everything these guys have already said I would agree with. I do NOT use a skimmer, I am one of a few that believe that skimmers remove more than waste and do more harm than good.
For larger tanks where 10% water changes are not possible every week i would consider a skimmer but for nano tanks a 10% water change every week is a better idea imho. I keep softies and a couple of LPS and they all thrive.
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