refugium

A refugium is a separate, designated area within an aquarium setup that serves as a habitat for beneficial organisms, such as algae, pods, and microorganisms. It helps maintain a healthy ecosystem by promoting beneficial biological processes, like nutrient export and biological filtration. Typically placed next to or behind the main display tank, a refugium provides a safe space for these organisms to grow, which in turn helps keep the main tank cleaner, supports fish and coral health, and enhances overall water quality. It is an essential component for maintaining a balanced and stable aquatic environment.