Fiji Cube Advanced Reef Sump is your great sump option due to its elegant design and unique features. All Fiji Cube sumps come with great features such as a full top support brace to prevent bowing overtime from the humidity and water pressure. Additional features such as interchangeable filter socks or filter floss holder allow you to choose your preferred mechanical filtration. The corners of the sump are also rounded for robust strength resistance. The sumps are designed with large equipment room (protein skimmer and reactor) to maximize equipment potential and they are refugium ready in mind to maximize absorption like ammonia, phosphorus, and other unwanted nutrients. To complement this great sump for your aquariums, all Fiji Cube sumps come with polycarbonate covers to reduce noise and evaporation from sump operation.