Protein Skimmers are a very important filtration part in a Marine Aquarium. They remove organic compounds/wastes before they even start to decompose and turn into Ammonia, and a reduction in ammonia means as well a reduction in Nitrates and Phosphates. So it just goes without saying that a Protein Skimmer is something not to be skipped in a marine setup - especially in a reef type aquarium. So a BIGGER SKIMMER makes more sense than a smaller one. as a rule of thumb it is advisable to use a skimmer rated for double the size of your aquarium.