The Aquario NEO Air Diffuser produces tiny air bubbles when compared to other air stones. This reduces noise and splash and allows for higher oxygen production in an aquarium. The?Aquario?NEO?Air Diffuser is made of transparent acrylic, making it more durable and less prone to breaking during maintenance or cleaning. Being part of the Normal series, these diffusers are compatible for both rimless an rimmed aquariums. Air tubing is required for the differ to function properly. The diffusers in the Special series lack the built in bubble counter, but has a minimal and sleek appearance that won?t take away from any scape.