From what I understand, you'd want a skimmer in the event there's uneaten food in the tank that the fish and/or anemone didn't want. The skimmer will help keep your water balanced by stripping water of waste and also increase your oxygen levels. I run a skimmer on my 29g salt tank and even with just live rock, it pulled out a little bit of gunk. Here's an easy read about skimmers that I thought highly informative. Hope I helped!
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