Choose from the best protein skimmers on the market for tanks 100 gallon, 125 gallon, 150 gallon, 180 gallon, 200 gallon, 300 gallons, etc reef aquariums. When getting a skimmer always remember that if you have a heavy bio-load it's best to get a bigger skimmer. Hard corals also require cleaner water and a larger skimmer than soft corals.