Coal reactor, an adsorbent box for aquarium

This box designed for filling with activated coal or any other adsorbent which commonly used in a saltwater tank. It should be placed to the inclined partition where returning pump placed. Filtering grid could also be printed as next: after slicing of a model by any redactor remove the top and down solid layers (I'm used RapR3D Visual GCode Editor). I wish a colorful reef for everyone!