Filtration by Nature Using macroalgae like Chaetomorpha, the Reef Octopus Light Reactor is a natural filter that absorbs and eliminates nutrients that cause algae growth from the water in your aquarium. The macro algae will eat the water's nutrients as it grows. The nutrients are taken out of your system after you harvest the macro algae. In addition to being an all-natural method of filtration, algae reactors offer copepods and anphipods a safe haven. By providing 360-degree coverage, the Reef Octopus Light Reactor's distinctive triangular waterproof LED light (IP67 Certified) strip inside the reactor optimizes light exposure for the algae, promoting growth and nutrient uptake. The macro algae grows rapidly because of the high-output LED strip's close proximity, which provides them with as much light as possible.