For somewhat complex reasons, it's hard to build a protein skimmer for nano reef aquariums. When getting a skimmer you should also keep in mind that getting a bigger skimmer than the one just big enough for your tank can be a good thing. There really are not that many good choices—but the ones we carry we recommend. You really can't overskim an aquarium.Related Products:Protein Skimmers by TypeIProtein Skimmers by ManufacturerIProtein Skimmer Replacement Parts. Useful Links: Why Do You Need A Protein Skimmer?IWhich Protein Skimmer Should You Buy?IProtein Skimmer Troubleshooting.