Aquatic Life 115 Mini Internal Protein Skimmer/Filter, 30-Gallon, 10-5/8"H x 3.5"W x 3.5"D Filter box area should be measured first to determine if the skimmer will fit into the filter box area Skimmer will not allow lid closing on tanks with hinged lids Proven needle-wheel impeller increases air-to-water contact Compact size makes this skimmer ideal for mini-reef aquariums Compact size makes this skimmer ideal for mini-reef aquariums Placement inside aquarium provides quiet operation Proven needle-wheel impeller increases air-to-water contact