Blue Marine algae reactor cultivates algae to reduce surplus nutrients which are dissolved in the aquarium water, such as nitrates and phosphates. The algae reactor is fitted with a LED Grow light tube using quartz glass to maximize light penetration and efficiency. For your safety this light is fully waterproof (IP68). The algae metabolism increases and stabilizes Ph from day to night, lowering dissolved CO2 concentrations, keeping dissolved oxygen stable from day to night, and increasing dissolved oxygen to levels higher to what can be achieved with skimmers alone. High-end LED light for optimal algae growth Opaque internal tube prevents light to be emitted to the surroundings