The present invention relates to a skimmer for an aquarium, and more particularly, to a skimmer which is installed inside an aquarium to purify seawater, which generates bubbles through water supplied by a motor and air supplied by an air hose, A bubble diffuser plate mounted on the upper end of the bubble diffuser plate, a bubble diffuser plate disposed on the upper side of the main chamber, And a water level control plate of a flat plate shape is mounted so as to be in contact with the side wall and the bottom face portion of the upper lower side of the lower side of the mouth, And an upper part of the sidewall to which the water outlet partition wall is coupled A main chamber provided with a discharge hole through which the wall penetrates, a main chamber formed on the other side of the main body in a longitudinal direction along the side wall and having an air passage through which an air hose and a silencer are inserted, A chamber cover which is formed on the upper side of the main chamber and has an opening to allow an air adjusting screw mounted on the air moving pipe to be fastened to the main chamber and a discharge port formed in the main chamber, And an air adjusting screw fastened to one end of the air moving tube formed in the main chamber and capable of fine adjustment as a screw having a thread formed on an outer circumferential surface thereof, The wheel mounted on the axis of the wing comprises a wing, (B) and a spring (c) according to the shape of a fin, and the pins of the three types are arranged in a triangular structure . Therefore, according to the present invention, not only the bubbles supplied into the water tank are made finer, but many bubbles are generated, thereby causing factors such as floating matters, dissolved organic matter, fish excrement and aquatic proteins in the aquarium, The bubbles collide with the water outlet bulkhead in the chamber and cause a lot of rotation. The hydrophilic agent is repeatedly adsorbed by repeatedly su
