Aqua Illumination Aqua Illumination Nero 7 Submersible Pump 4000GPH 4000GPHAqua Illumination's Nero 7 creates an adjustable broad flow that is strong but gentle at the same time. Traditional propeller designs produce a hard stream that can irritate corals where the Nero 7's innovative propeller pushes water in a wide pattern that can move foods, detritus, or other free floating particles around without blasting corals directly. Powerheads have many different uses around a reef tank, but the main goal is to produce enough