Filter media cup with flow enhancing slits

A reusable filter media cup used with an aquarium tank containing aquarium water intended for support of aquatic life, a quantity of filter media that removes contaminants from aquarium water, and a water-collecting support device in fluid communication with the aquarium tank, said filter media cup comprising:

• a height dimension and a width dimension, said height dimension greater than said width dimension;
• an outwardly-extending radial flange;
• a bottom end with a non-perforated center area in an opposed position from said radial flange;
• a perimeter wall extending between said radial flange and said bottom end, said bottom end and said perimeter wall together defining a non-compartmentalized interior space, said perimeter wall having a bottom portion adjacent to said bottom end and a top-to-bottom narrowing taper;
• a plurality of perforations through said bottom end between said non-perforated center area and said perimeter wall;
• a plurality of slits through said bottom portion of said perimeter wall, each of said slits extending to said bottom end, none of said slits having interconnection providing direct fluid communication with any of said perforations in said bottom end;
• and
• said radial flange, said bottom end, and said perimeter wall made as a one-piece non-disposable unit from molded, waterproof, and non-toxic material, wherein when said radial flange becomes supported by the water-collecting support device in fluid communication with the aquarium tank, such that the fluid communication causes removal of aquarium water from the aquarium tank, flow of the aquarium water through said non-compartmentalized interior space, exit of the aquarium water from said non-compartmentalized interior space via said perforations and said slits, and return of the aquarium water to the aquarium tank, and also wherein when a quantity of filter media appropriate for removal of contaminants in the aquarium water that are potentially toxic and life-threatening to marine life residing in the aquarium tank is placed into said non-compartmentalized interior space, fixed positioning of the filter media in said non-compartmentalized interior space then exposes the filter media to contact with the aquarium water moving at a rate of flow through said non-compartmentalized interior space and causes removal of potentially toxic and life-threatening contaminants from the aquarium water without channeling or clogging of the filter media.