An apparatus for aquarium water filtration comprising a macroalgal growth means defining a first macroalgal attachment material and a first bubbling means and a containment means including a housing defining a first water inlet and a gas outlet a docking means defining a first docking surface configured to complement a shape of an aquarium wall the first docking surface defining a first illumination port to enable illumination to pass through the illumination port to illuminate the macroalgal attachment material and a first coupling means to secure the macroalgal growth means to the containment means such that a first portion of gas bubbles emitted by the macroalgal growth means is confined to the housing.
