Aqua Illumination Nero 3 Submersible Circulation Pump 2000 GPHThe Nero pump you know and love, now in a smaller form factor. Aqua Illumination's Nero 3 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 3'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